How do I stop stuttering?

How do I stop stuttering? I'm 17 i have speech problems, stuttering started at grade 1 It got worst when i grow up. before i was extrovert, always talking with my friends. but now i'm introvert dealing with social anxiety, depression, suicidal thoughts. My family always said practice to talk and slowdown it doesn't fcking work at all. I don't like social interaction with any people. I got bullied & teased so many times because of my stutter. I'm worried about my future. just imagine how i'm supposed to do when i'm adult and working. everyone will think i'm mentally disabled person. i'm planning to die at 20 yrs old i don't like to suffer with stuttering anymore..... Any advice? and sorry my english is bad this is my 2nd language :(