It is well written, yet you could emphasize the situation a little bit more... By that, I mean, I find it a little bit too short...
I understand what you mean: girls are attracted by boys and then realize that they were not that important...
Nevertheless, I do believe teenagers can love, instead of "having crushes"... Not all... And not in the first years of adolescence... but still...
(it's a personal point of view, not a critique... let's just say i might have been reading Romeo and Juliet too many times... ;) )

I do have a suggestion on the formal aspects...
In the first stanza, the way you divide the last two lines cuts off the flow a bit...
You wrote:
"You'd make me smile with every glance and I'd
laugh because I had no chance."

I would suggest:
"You'd make me smile with every glance
And I'd laugh because I had no chance"

*keep going*
isabel

5/5. Short and to the point, nothing extra, but what you had was good. I liked the kind of free-flow, no rigid structure but some rhyme. Nice one.