I've been told by a lot of friends that, when around girls, I try too hard to impress people. I'd like to believe that my behavior comes off as natural, but I do notice when I start to feel "needy" or "attention-seeking". It happens too much. I know my problem is rooted in how much I care about other peoples' opinion of me. How do I stop caring about other people and just say "Fuck It"?

Edit: I'm not an overtly nice guy. I bust peoples' balls. But the attention seeking vibe is prevalent.