How should a 19 year old tell someone he likes her?

Anonymous
I've known her since I was 14, but I don't KNOW her all that well. And we go to different colleges, but we live in the same neighborhood.

I think I'm past the age of "crushes" and "liking" a girl. Is there a way I can convey my attraction towards her in a mature way?

Frankly, I don't know if I'm interested in her, or if I'm just physically attracted to her. Sometimes, I feel strong feelings for this girl.
Updates:
+1 y
Well, I'm 19, not 25 with a career. So madmisskelly's answer is way too mature.
How should a 19 year old tell someone he likes her?
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