Forget all the you shoulda done this, you should done that. It didn't happen, and it won't happen. You're not that type of person.
All you can do is be yourself. If a chick don't like it...oh well.
Yeah, it'll hurt for a while, but you'll get over it. Everyone does.
As you get older, you'll change...and you'll know better next time.
Just keep yourself busy for a bit.