<human>: Can you provide a brief rundown of the text in within 3 sentences?

Hey /RA i could use your help with a girl "situation" I suppose you could call it. I'm 17 year old male, she's the same age, and not at all the girl that I thought that I would end up liking. I'm about 6'4" and 280 she's about 5'2" and maybe 110. 

I've never had a single girlfriend, never kissed a girl or even been out on a date. She's more experienced in the dating scene, but that doesn't bother or worry me. I've been told I'm a handsome guy, but that's never done a lot for my self confidence, since I've still never had any luck with girls. 

So now back to my specific situation. This girl is amazing, smart, funny, easy to talk to and fun to be around. Before I even liked her I always said to my friends that she was the "prettiest girl in the school". She's absolutely drop dead gorgeous and that's what gets me. I have some inkling that she likes me, she always looks at me during our AP Government class, she always says hi to me in the hallway between classes. She really likes my phone and has asked to play with it on several occasions, and I of course obliged. However, there are times when she isn't connecting with me, and when that happens I get disappointed and discouraged. So guys and gals I'm not sure what to do. Do I go for it and risk embarrassing myself? Or do I let it fizzle out (and I don't think it will)? It bothers me, not knowing if she has any sort of feelings for me. And yes, I do go to the gym and play on the basketball team, but I need to get in better shape, and I'm working on that, but since I want to have a serious relationship maybe extending to college, and there are only so many months left in the school year. Also, she offered me grapefruit in class today...I don't know if it means anything but she only offered it to me for what its worth.
<bot>: I've got no girl experiences and I really like a girl who's out of my league but is giving me really good signs sometimes but mixed signals other times, and I need some advice.