I'm on a (sorta) simlar boat as you mfh. First relationship was 20 y/o (I'm 21 now). Can't say it lasted long, or was it very good for me. Sometimes, when things don't work--it wasn't meant to work, ya know? So if you're on a date and things are sorta akward...doesn't necessarily mean it's your fault.
On that note, also realize that girls in their early 20's and late teens may be more on the lookout for 'fun.' It's a tad trite, but a lot of the playboy types i know get women chasing them, but the more domestic guys don't get much dating.
Women in their early 20's are in their prime, they have every Joe, John and Kenny knocking on their door...I think the older women are the ones who understand the ideas of compromise and value in a relationship aside from the 'fun' factor. So...no need to rush.