Girls find it cute when you're like a kid, but as an adult you risk sounding less intelligent, even though you're probably a genius. The only way I got over it was being a loud mouth, and it may sound cliche, caring less about it. I was only a moderate stutterer to begin with and the less I cared the less it came up. Most people don't care how you say it, they just want to hear what you have to say if it's relevant. Those girls aren't worth your time if they dismiss you over your stutter, they're not for you, find someone less shallow..