I totally understand how you feel. I've dealt with a stutter my entire life, and I too thought that I couldn't make jokes, make witty comments, etc with a stutter. Later I found out that is really all how you treat your stutter; if i carry yourself with confidence and disclose to someone that I do stutter before i speak, usually people will understand (and if they don't, it's a built in people tester. If people care that I do stutter then I treat it as a "well at least I know you're a shitty person" and I don't want to be their friend anyways). Really, at the end of the day, everyone has something that they feel limits their ability to be the person they wish they could be (whether that be appearance, acne, height, or other speech traits like a thick accent). And people who judge you or think you aren't funny just because you speak differently is an asshole who doesn't deserve your friendship anyways. Always remember that it's important what you say and not how you say it. Keep your head up man, you're not alone and it does gets better.