I'm sorry you're not getting enough encouragement to be all that you can be. In this thread you've typed up several clear, coherent notes explaining your situation. There are lots of people who don't have enough education to do even that much. ADD alone might mean there are some types of work you would not excel at, but it doesn't render you incapable of holding any kind of a job. That's ridiculous. I don't think you should plan on becoming an air traffic controller. I'll bet you do know how to wash dishes and make a bed. If nursing interests you, look into becoming a home care attendant . . . or a nurse's aid. I did that for 8 years, after failing at some office jobs. Eventually I did complete nursing school and worked as a nurse.

You're main problem isn't ADD. Lots of people with that diagnosis are employed. Depression is a much bigger problem because it keeps you stuck and unwilling to try things.

Don't let all these letters of the alphabet define you. You are not useless! Look for some employment, and don't feel that any job is beneath you. Try things. Get some experience . . . doing anything. You'll meet people and you'll have other feedback to counterbalance what your mother is telling you. If there's a motel near you, see if they need another person to help clean rooms. Don't be afraid to start at the bottom. Try to find anything, even if it's just 2 days a week. It will be a start. Show up on time and do your best. Your self-esteem will get quite a boost.