Is AUTHOR wrong in the post ? POST : Ok so this is my first ever post so go easy on me.

So let me set the scene, im at a friends birthday party and we are 7 girls in total ( everyon is under 15) it's about 9 pm and we are playing a game and we end up talking about who is the bravest in the group, so i want to prove that i am brave by going outside in the dark ( while it's raining ). Keep in mind that some of my friends have been talking about how scared they are that someone will come in and kill us. 

Anyway so i go outside with another friend let's call her L. And we dance for a bit then go to the corner of the house and i scream so dose L,( this was my idea btw ) so we sneak to the other side of the house and stay ther for about 2 and a half minute and then we run to the door and ring the bell. After that we go back and L's phone has been ringing for some time but my phone is inside the house. So after we have been outside for about 7/8 minutes we go back inside and i see two of my friends crying and breathing heavily in the corner and im shook. Me and L starts apologising and hugging them and saying that we didn't know they thought it was real and that i feel really bad about what i did. They had messaged their parents to come get them. They eventually calm down and we go down stair and play with ballons and stuff. Their parents come and pick them up, My friends say it's fine and that their okay now but i still feel pretty bad about what i did. They ended up going about 15 minutes earlier than they would have otherwise. Me and the birthday kid starts playing with some ballons and she says that it's okay and i should't worry about it.

But I still feel really guilty about what i did and im wondering if they where overeacting or im an asshole for scaring them, what do you think??
Ps thanks for reading and sorry if i spell any words wrong english isn't my first language.