What do I do about a guy that is obsessed with me?

Get a restraining order.

You start totally ignoring him. When you see his name on your caller ID you don't answer. nor answer his messages he might leave. When you see him around you act like you never notice him. If confronted face to face, just be polite but be busy and have something else to do. If push comes to shove, tell him to stop harassing you or you'll be calling the police and make sure you do that if you have to. Make sure he understands you have no interest in him. if in fact you don't! Also, try avoid being where he's likely to be.

Ignore him and become ambivalent. It sounds easier than it really is. Ignore him by not taking his calls or talking to him if you see him. Don't be rude -- you can ignore someone politely. Don't make eye contact and stay calm. If he sees you're emotional then he'll play on that. I think the key is ambivalence. Keep your emotions away from him completely - especially the angry kind. Learn to make a poker face!

get a restraining order.

If you are a minor, your parents should have no problem getting a restraining order on this guy

You have to determine which is more important to you - keeping your friendship or going out with this guy. I was very upset with my best friend for having sex with someone I liked, and it totally ruined my friendship with her because she betrayed my trust. It may not matter to you right now, but you may regret losing her as a friend in the long run. I totally lost my best friend at that time and lost trust in her because of what she did.

Well that depends on whether or not you like this guy.if you like him then I guess that you probably wouldn't mind him fussing so much over you. What do you mean by if you say something wrong he harasses you? That sounds almost like he can be a real jerk and you should put quite a bit of distance in between the two of you.if you don't like this guy you need to be straight forward with him and tell him so. You might also want to add that you'd like for him to stop driving by your house and calling you. If it becomes a problem you might want to involve your parents.

Do not let that go lightly. Please do tell your parents or guardians. This could be a serious matter. There are a lot of sick people out there these days.

If it bothers you that this guy is stalking you, and he keeps harassing you, you can call the cops or tell your parents or an authority figure. You can also tell him that you will not put up with his behavior and that you are not interested in him and that if he does not stop harassing you, you are calling the police. If he still does not stop harassing you, make sure someone in authority knows because stalkers can be dangerous.