Ask your DM if you can reroll your stats.
Seriously, though, all the charisma tips; smile, match body language, active listening, etc...are only structures built on the foundation of sincerity. In other words, if you're genuinely interested in other people, it'll show. I'm not really sure how to tell someone to BE more interested in people, but that's where it starts.
_________________
Everything would be better if you were in charge.