What you need to do is not care. I know this may be hard. Not sure how old you are but all throughout my teenage years i cared way to much about my stutter and that is what held me back from being me. Nowadays i care less and i speak more fluently. It’s all about confidence. Build confidence anyway you can. Read more out-loud, give the presentation over and over, talk to people. It takes practice and effort. Don’t give up ever.