Bro keep your head up! Many people stutter my man it’s not that much of a weird thing in 2019. Try to keep it calm and stay cool bro! And if you get stuck on a stutter who cares🤷🏽‍♂️ if they make fun of you because of it act like you don’t even care like it’s part of your personality life with it and try to keep it as calm as possible don’t have fear to stutter because you will anyway earlier or later!! And for most people it is just a time thing at first they sure probably will notice your stutter but as time goes and you speak more freely and your stutter is known by then they won’t even really recognize it anymore because it’s just such a small think in day to day convos. And just a side note your teacher is not allowed to give you a worse grade and no teacher would ever to that.