What should I do? I feel like I will never have enough courage to tell the girl I have had a crush on for 15 years how I feel about her.
Have you ever talked to her about your feelings?
No, I can't bring myself to do it.
Fifteen years is a lot of time to waste thinking about a girl that you have a crush on. You need to gather your courage, be honest and tell her how you feel.
I want to but I can't.
It's important to gain confidence in yourself. You can develop your self-esteem by working on what you may feel insecure about. This will help you to have more courage.