I've been obsessed with a girl for too long and I can't bear to keep it a secret any longer.
What do you mean by you are obsessed with her?
I think of her a thousand times a day. I can't stop thinking of her, no matter what I do.
If you feel obsessed with someone, you should probably take some distance from them to help you get proper perspective. It is unhealthy to think of someone else constantly; you should try to fill you mind with other things. A hobby or a class to help you meet new people could keep you from thinking about her so much.
I don't think taking a class will help. It's going to take another person to help me get her out of my mind.
If you feel so you should try counselling. I'm sure that'll help you with your obsessive behaviour.