I used to feel the exact same way. I’m now 24 and I still stutter (though not as much as before). I wasn’t bullied for it, I had supporting family members and was fortunate enough to see speech therapists and even travel abrod for a “stuttering camp”. I still felt worthless. I wanted to be like everyone else and hated when people would tell me stuff like “oh I like your stutter, you should embrace it”. There was a constant sadness and anxiety that existed in me. I tried to compensate for it by working hard at school and was subsequently bullied for being a nerd. I’m not sure how or why but I got to a point where I had so many terrible experiences with my stutter that I simply accepted it as part of myself. I started appreciating how different I was than most people around me. I started talking about it in public and gained some confidence and self-esteem. Most importantly, I started appreciating the little things in life and embracing my uniqueness. I don’t expect to convince you that things will get better, but things do get better if you want them to. The fact that you’re on Reddit talking about it is a huge first step in my opinion. Don’t loose hope.