I feel suicidal and scared Im in love give me advise please?

You're doing all you can to pursue her, and she still refuses you. My guess is that she likes someone else or maybe she is not interested in a relationship at this point(some girls are just like that), or shes just playing hard to get. Either way, it's not worth killing yourself over. Rejection hurts, I know, but there are more fish in the sea. Don't ever let a girl run you down, especially so young at age, you will find that shes really not what you need and want in time.