A girl really likes me, but I'm not interested.

[Pinkamena]

Nearly obsessed, really.
I think in my charismatic ways, I might have accidentally lead her on, however I have no interest in forming a relationship with her. She's very immature.

[Croconaw]

You shouldn't have to form a relationship with her if you don't want to. It's sort of bad if you lead her on, even if it wasn't your intention.

[Miserabilia]

http://www.summercampculture.com/wp-content/uploads/2012/10/overlyattachedgirlfriend.jpg
does she happen to look like this?

[Appypollylogges]

Well if you don't wanna date her then don't, but let her down nicely.

[Pinkamena]

Well if you don't wanna date her then don't, but let her down nicely.

I'm one of those types of people who tries to please everyone... However, she's possibly suicidal, has attempted it before over a guy, and I really don't want to be the cause of another attempt

[Appypollylogges]

However, she's possibly suicidal, has attempted it before over a guy, and I really don't want to be the cause of another attempt

I see...
Still though, the most polite thing to do would be to not let her on.
Just tell her that she deserves someone who is interested in her.
If you just date her out of fear that she'd kill herself otherwise, that wouldn't really be a healthy situation would it?

[badthoughts]

Nearly obsessed, really.
Not a bad problem to have.

she's possibly suicidal, has attempted it before over a guy
Forget what I just said. Get away from her. Run. As fast as you can.

[badthoughts]

edit

[believable]

I completely understand what you are feeling. I liked this girl for quite a long time but never knew if she liked me. Suddenly out of nowhere, came this other girl who liked me way too much and practically stalked me until the end of the school year. She tricked me into telling her that I had feelings for the girl I liked and then tried to keep us far apart from each other. The girl who followed me around had problems and seemed to have depression thoughts. She asked me out before the school year ended via eMail and I was steaming. I was very mad since I had made it very clear that I didn't like her and she did it out of pure jealousy. She finally ended up blocking me from the girl for what she thought was for good (not true though).

I would personally recommend telling her that you are simply not interested. Dropping hints may not work and she may not be picking up on the hints. This mainly depends on whether you would like to be friends with her or if you simply want her out of your life. The girl who went crazy over me also started to have suicidal thoughts after both me and the girl I have a crush on got mad at her.