It gets better. The older you get, the more people will realize that (a) you’re just dealing with the hand your genes dealt you and (b) mocking a stutter isn’t actually funny. Most adults will try to be decent human beings. Yes, there are jerks sometimes. And, yes, sometimes people don’t realize you’re struggling and will mock you without understanding what’s going on. But it gets much, much better. The truly magical thing is that, the older you get, the less you care what other people think. I’m in my fifties and, having been mocked mercilessly as a kid (thanks for nothing, Porky Pig), I promise it gets better. Keep the faith.