Suttering is ruining my life and giving me anxiety.

Suttering is ruining my life and giving me anxiety. I have have had stuttering problems since a child and it has affected my life. Im afraid to talk to people, make phone calls, order food and many other things… When i have a job interview, i always ruin it by giving a poor interview. Like when my date of birth or name is asked, i can’t get the words out and it looks like i dont know my own name or birth day because im so afraid that i will stutter. But when i do self-talk or sing i never stutter. How do i overcome this problem? 😓