My stutter comes in waves of weeks or months where it gets really bad I just tried not to focus on it too much. You just have to except that stuttering is part of who you are. There'll be good and bad period. Mine completely tied to my mental state. If I feel bad or anxious it gets way worse so I just focus on calming myself. You seem very hung up thinking you don't fit girls criteria of a partner. Every girl is also worried they aren't what they should be either. Every is a bit that way. Geneally people aren't assholes. Id most most I'd peoples awkwardness around your stutter is a response to how you feel about it. if they see you are OK with your stutter they will we be OK with it. . Keep going with the improv and if you occasionally get really stuck and kill a scene just move on a try it again. It'll be hard at first but Everyone will see you are OK so they won't worry. Just keep on putting yourself out there it won't do anything but improve your situation. I'm a pudgy pale nerdy dude that some days can't get a sentence out and I have a good job, a great wife and more friends than I have time. The stutter doesn't own you man.