Seth, don't give up being a gentleman just because your friends make fun of you. Shame on your friends for doing that!! What I think is that is why young people aren't being chivalrous, because they think someone will make fun of them.
Stand out from your friends. Stand out from the crowd. Continue to be a gentleman and like you said, some girl will find it charming. Don't stop asking girls out. I wish someone would have been bold enough to ask me out when I was younger. I would have said yes. Even if it didn't work out. I think most girls are like that. Maybe focus on the girls that you wouldn't normally consider "hot". You'd be surprised how many "yes" answers you get!
Good luck!