How did you get over your confidence issues?

How did you get over your confidence issues? I've been a PWS (Person who stutters) since I was a kid and it has shaped who I am to a great extent. I only stutter about 5-7% of the time (as per tests I've taken in my brief therapy stint), but to me it feels like a lot more. I think this is the reason I'm very introverted and shy (at least until I'm comfortable with someone and then I'm extroverted). I've never been able to flirt, or felt confident enough to talk to girls. I've only dated a few people, and need to find a way to get my confidence up. I'm confident about who I am as a person, my looks, and intelligence, but cannot convey it, or ever feel comfortable going up to someone to talk to them because of my stuttering. Reddit, what techniques have you used to get your confidence up?