Look, I've been in a similar situation before, a dozen times actually... I started to homeschool myself, sorry don't know how to say it in English but whatever, so. Homeschooling really helped me, I got a way better mental health, I started to accept my stutter, and it really decreased even tho its still present. Giving up is the worst thing you can do rn even tho I know how horrible it is to live like this. Every human being is trying his best to succeed in life, just like you. Your trying your best but you have a stutter, so what ? Fuck them, find solutions like I did because there are some, but dont give up. And stop hanging out with these assholes, you dont need them. You have to spend time with yourself, and be your own allie instead of blaming yourself because its unfair, your doing your best