How old are you? xD
Anyway, that's a pretty nice thing, you got a "crush", can't really tell you to make a move or not, you decide it, but yup, you are pretty interested in her, it a nice thing, all that "only she matters" stuff.
You probably should let her know how you feel, specially if you thing she also likes you, but as I said that's your decision to make.
Good luck with whatever you choose to do, though, hope for the best.