[Help] Stuck fearing I’m not good enough

Im not 100% sure how to put this, so I'll keep it short and to the point. I am 15M, and there's a girl I like at school. I've liked her for about 5 years, but in the midst of moving schools and stuff, I've never had a good opportunity. I'm finally back at my home school, so I have an opportunity there. But now that I have a chance, I'm fearing that I'm not good enough. The girl I like is as close to a perfect human being as I've ever seen. Talented, caring, super intelligent, pretty, the whole shabang. I feel like I have a chance, but I'm stuck fearing that I just won't be good enough. I don't know what to do. Any advice is helpful. I really want to tell her I like her, but my nerve gets in the way every time. If I need to elaborate for anybody to give advice, ask me, I don't mind. Thank you for your time, kind people of Reddit.