Am I too stupid to make a life for myself?

You're not stupid. Honestly, I think you're just so anxiety ridden and hard on yourself you're distracted. Don't worry about it so much. I used to be the same thing. I'd get one small thing wrong, and freak out about the next task while beating myself up about the last, and mess up something bigger cuz I was so distracted. Just learn to relax and be easier on yourself. You're panicking too much. Maybe try to see your doctor and see if he can give you some meds to help with anxiety? That's what helped me. I'm currently an A student in college, and have a 30 hr week job at petsmart. You just have to go easier on yourself.