It gets better when you get older. Plus, you can distance yourself from the assholes who make fun of it. It really helps weed people out of my life, I use the example: would you make fun of someone in a wheelchair? If not, why are you making fun of me? That usually gets them in the right mind set. It’s not our fault we can’t speak like everyone else. My rate of speech is at 180-200, well above normal. When I focus on elongating vowels, I can get it down to 160ish. That’s still above normal, but it helps. I would suggest getting a speech therapist if your parents will do it. I have my son going to one twice a week for a private one (and once a week in school) and I have seen massive improvement for him.