What to do when a professor is too busy to guide my research? I am currently a Graduate student. 

I had the opportunity to do some research as undergraduate for which the professor seemed very busy. I tried my best to "bother" him as much as possible with emails of when to meet up, questions and guidance for my research. The research didn't go far as you can expect from an undergraduate without any guidance (the type of guidance like a weekly meeting or reading material or direction for the research) I ended up asking a recommendation letter from him in which he butchered me and destroyed all my chances of getting in almost any college. This was after he happily agreed to write me a recommendation letter and was so happy to write all positive words. After I shared with him that I got accepted into a college. He later went on to explain that I "wasn't involved enough". I felt at one point that I was starting to harass him by sending emails every 2 days and stopping by his office hours uninvited. If anything I would expect the opposite kind of complain. That made me feel bitter and do some self-criticism, and be more persistent in the future.

Problem is that I am in a new college (as a graduate student) and facing the same issue. The professor I am doing research with doesn't meet with me, doesn't respond to my emails. And the research hasn't even properly started yet. I am highly-motivated and can take self-initiative but without direction I don't know what to do or focus in. I feel again that I might be repeating the same mistake... so I really don't know what I can do better or if there is a misunderstanding from my part. I have send a chain of 5 emails that went without a response over the course of the last 2 weeks. 


How do I approach the professor and what do I say?
Is there a limit to the emails or office visits? Do professors take this as genuine interest or am I being exhausting them?
Is this a way for a professor to kindly stop research or any ongoing projects? 
What am I doing wrong?!
If this kind of thing happened once, then I might chalk it up to chance (not everyone is friendly or professional).  But if it happens twice, then I think it is more likely that you are either not reading the situation correctly or are behaving in an unprofessional or at least strange way (and probably don't even realize it).  But it is basically impossible for strangers on the internet to figure out what precisely is going on.  After all, we've never met you, seen how you interact with people, etc.  

The only real solution is to speak with people you trust (friends, mentors, etc) who actually are eyewitnesses to what is happening and ask them for their take on it.  Even more importantly, trust them if they tell you ways that you need to change.