Yeah, having a stutter sucks, but remember that no one is perfect. Everyone has at least one imperfection (usually many), and not talking perfectly isn't that bad. Honestly, everyone has something about which they're insecure, and most people barely notice it. Your stutter probably isn't as big of a deal as you think. Also, odds are it wasn't your stutter than prevented you from getting the job, so don't worry about it.