If I can give you some advice, if you are a teenager now... this is the worst it will probably be. At least, that's what you should keep telling yourself. Dont be afraid to stutter. Don't be afraid to be you. Don't hide. It makes it all worse. People can be mean and make fun of you, but you have to live your life and start not caring. check out r/stoicism to learn more about making the most of your challenges.