I am the loser in my family

I am almost 21 years old and a male. I am in college, but the classes are so easy but they won't simulate the real world where I will definitely fail. I dropped out of high school and gotten a GED and gotten kicked out of the house at age 17. I moved into my grandparents house to go to school although I am failing miserably. My grandparents said that if I fail college, they might send me to a group home. I feel like a loser compared to my more successful cousin in the Air Force. I am the autistic man-child loser in my family. I always fantasize about a different life where I am successful while my cousin falls into disrepair, but that is rather a fantasy. I don't have a car, I'm autistic, I live with my grandparents, and I can't do anything right. Nothing like a good ol' Remington in my closet to cure the pain.