She's out of my league?

I've like this girl for about 7 months... Yeah that's right 7 months. I'm to much of a to tell her how I feel. I've gone out with other girls to try and forget about her but I still have strong feelings for her. There are a few problems though. She is way out of my league. I've hung out with her time to time but never done any serious chilling. Ok so maybe she's not WAY out of m league but she is very popular. I not the most popular guy but I am kind of up there on the whole high school popularity ranks. One of my main problem is that I'm skinny. I play as many contact sports as possible and I lift daily. I'm not the weak little skinny guy but I'm still under Weight. I would love for her to see past this but I'm afraid that I won't think I'm good enough for her. Please help me! Any tips will be happily considered. - Nolan salani