I think I'm a wrong for fapping to my female friends
Why do you think what you did was wrong?
It just feels wrong? I do feel bad about think of them like that.
We are all humans and need to fulfill our sexual desires sometimes. It's fine to do that to people that catch your eye, no matter who it is. It's all within your imagination, and as long as you don't discuss it with people who are not interested in it, then there is nothing to be ashamed of.
I don't really get it. It's only wrong if you get caught by htem, right?
As long as your thoughts aren't interfering with your friendships, then there isn't anything wrong with it. Just be sure to keep those thoughts to yourself.