Have a crush on someone but need advice.?

Ok, so Ive had a crush on this girl for years(talking about ever since I met her). Now, she is possibly the smartest person in our school, she is very pretty, somewhat popular, and is huge nerd and likes the things I like(We are friends). Now, Im not very popular and Im a tad bit shy. Also one of my other friends is dating her already, and I would never do anything to hurt either one of them. I just really need advice right now. I even have some other girls who are friends, but I like this particular one so much, and Ive liked her for years. Nobody is better!

Also, I think my school is a bit weird. There is a weird amount of nerds/geeks(Like I), so being a jerk or something like that isn't that desirable for anyone. And sorry for all the grammatical mistakes. Typing on my iPhone and cant type fast and well on this thing.