help

help I’m a 15 year old that has issues with stuttering, I mostly stuttering when I have much stress or if there’s much stuff going on in my mind, but recently my “friends” have been making jokes of the way I talk because I stutter, and it’s actually bothering me a lot, I’m a very shy person with much social anxiety and I have trouble reaching out to people, does anyone have some advice or tips of what I could do?