You know I get the same feelings. Im a failure, can’t achieve anything in life no social life and all this stuff. Sometimes I get rlly depressed to the point that I can’t even get up. You know what I do??? I go to sleep. I don’t set an alarm or anything just go to sleep. Sometimes up to 14 hours. When i get up all those feels are somewhat diminished to a certain extent that i can get up and carry on with my day. For me it’s like a cycle. Stammers get depressed sleeps stammers get depressed sleep.