user8206: For the record I'm new to meditation.
I'm trying to observe my breathing without controlling it. That was the guidance from someone I met at a buddhist meeting. 
Though sometimes I just ralize that I do change the frequency and deepness of it. I don't want to do it, just happens.
Is it just me or it will be better with practice?

user5000: Don't try to force or control anything, observe and just note it and continue.
It's not that much important how your body reacts to your meditation, but how you deal with these bodily reactions. Yes, there will always be some bodily reactions that will distract you from meditation, but the point is to not get distracted and just remain in the "present moment".
With practice you will be less distracted, until you won't be distracted any more. Practice diligently and you shell rip the rewards soon.

user151: That sounds like bad advise if you are practicing insight meditation. This answer assumes the practice in question is insight meditation.
"You" don't control the breath.
I had this same question when I was starting out and the teacher basically said "You don't control the breath so there is no problem, just keep seeing things as they are moment by moment". 
For me, it was just a matter of losing my wrong view that I had to be concerned that I'm controlling the breath. If I'm thinking that I'm controlling the breath then I would focus my mindful awareness on this thinking(instead of worrying that I was controlling the breathing).

user295: 
For the record I'm new to meditation. I'm trying to observe my breathing without controlling it. That was the guidance from someone I met at a buddhist meeting.

On objective of meditation is to calm the fabrication. By controlling you are, in some instances, you will be creating fabrications.

Though sometimes I just realize that I do change the frequency and deepness of it. 

This you should be careful not to do. There is a stage in Anapanasati you have to calm the breath, but in this instance also you just have to intention to calm but not the action to calm, hence you are not doing any action to calm it.

I don't want to do it, just happens. Is it just me or it will be better with practice?

If it happens naturally then it is OK. The depth of the breath change generally becoming shorter but some cases if there through disturbances this might become deeper.
Also see: 

Anapanasati: Mindfulness with Breathing - Unveiling the Secrets of Life by Ven Buddhadasa Bhikkhu
Ānâpāna,sati Sutta


user8211: A simple and practical solution for occurance of own control of breathing is intentionally stop fabricated breathing for few moments and observe. Then you will be able to sense that the body (spontaneous neural discharge from the brain to nerves that innervate respiratory muscles) automatically start breathing process after few seconds of tolarance period. Now you can start observing the natural breathing. Most teachers dictate to make several deep breaths before start the meditation in order to make an exact understanding of the touching point in the breathing channel. This practice leads for some novice practioners to unknowingly continue the same practice of fabricated breathing. But we should always endeavour to 'let it go' and become just an observer without interventions or conclusions. This may be called 'Choiceless Awareness'. May the Noble Triple Gem Bless You

8206: <p>For the record I'm new to meditation.
I'm trying to observe my breathing without controlling it. That was the guidance from someone I met at a buddhist meeting. 
Though sometimes I just ralize that I do change the frequency and deepness of it. I don't want to do it, just happens.
Is it just me or it will be better with practice?</p>
 5000: <p>Don't try to force or control anything, observe and just note it and continue.</p>

<p>It's not that much important how your body reacts to your meditation, but how you deal with these bodily reactions. Yes, there will always be some bodily reactions that will distract you from meditation, but the point is to not get distracted and just remain in the "present moment".</p>

<p>With practice you will be less distracted, until you won't be distracted any more. Practice diligently and you shell rip the rewards soon.</p>
 151: <p>That sounds like bad advise if you are practicing insight meditation. This answer assumes the practice in question is insight meditation.</p>

<p>"You" don't control the breath.</p>

<p>I had this same question when I was starting out and the teacher basically said "You don't control the breath so there is no problem, just keep seeing things as they are moment by moment". </p>

<p>For me, it was just a matter of losing my wrong view that I had to be concerned that I'm controlling the breath. If I'm thinking that I'm controlling the breath then I would focus my mindful awareness on this thinking(instead of worrying that I was controlling the breathing).</p>
 295: <blockquote>
  <p>For the record I'm new to meditation. I'm trying to observe my breathing without controlling it. That was the guidance from someone I met at a buddhist meeting.</p>
</blockquote>

<p>On objective of meditation is to calm the <a href="https://en.wikipedia.org/wiki/Sa%E1%B9%85kh%C4%81ra" rel="nofollow noreferrer">fabrication</a>. By controlling you are, in some instances, you will be creating fabrications.</p>

<blockquote>
  <p>Though sometimes I just realize that I do change the frequency and deepness of it. </p>
</blockquote>

<p>This you should be careful not to do. There is a stage in <a href="https://en.wikipedia.org/wiki/Anapanasati" rel="nofollow noreferrer">Anapanasati</a> you have to calm the breath, but in this instance also you just have to intention to calm but not the action to calm, hence you are not doing any action to calm it.</p>

<blockquote>
  <p>I don't want to do it, just happens. Is it just me or it will be better with practice?</p>
</blockquote>

<p>If it happens naturally then it is OK. The depth of the breath change generally becoming shorter but some cases if there through disturbances this might become deeper.</p>

<p>Also see: </p>

<ul>
<li><a href="http://www.dhammatalks.net/Books3/Bhikkhu_Buddhadasa_Anapanasati_Mindfulness_with_Breathing.htm" rel="nofollow noreferrer">Anapanasati: Mindfulness with Breathing - Unveiling the Secrets of Life</a> by Ven Buddhadasa Bhikkhu</li>
<li><a href="http://www.themindingcentre.org/dharmafarer/wp-content/uploads/2009/12/7.13-Anapanasati-S-m118-piya.pdf" rel="nofollow noreferrer">Ānâpāna,sati Sutta</a></li>
</ul>
 8211: <p>A simple and practical solution for occurance of own control of breathing is intentionally stop fabricated breathing for few moments and observe. Then you will be able to sense that the body (spontaneous neural discharge from the brain to nerves that innervate respiratory muscles) automatically start breathing process after few seconds of tolarance period. Now you can start observing the natural breathing. Most teachers dictate to make several deep breaths before start the meditation in order to make an exact understanding of the touching point in the breathing channel. This practice leads for some novice practioners to unknowingly continue the same practice of fabricated breathing. But we should always endeavour to 'let it go' and become just an observer without interventions or conclusions. This may be called 'Choiceless Awareness'. May the Noble Triple Gem Bless You</p>
