I know this feeling and situation very well. It's a sucky place to be in
It's hard to feel motivated to do or try something when you're severely depressed. But one thing is to think about is, is this all that you want your legacy to be in life? Do you want people to remember you for more than what you have done so far? And more importantly, do
you want your life to be more than what you've done so far? If the answer to the last two questions is yes, then it's worth trying again to do something different. You've probably tried many times before, but the only way that your life will become more than what it is now is to keep trying. Not continuing to try will equal no change.
Another thing way to try to rid yourself of feeling that you cannot change is to prove yourself wrong in a small way. For instance, if you're feeling like you have no competency in anything, do something small that you're competent in. Even if it's something like organizing your room, or learning a new song on a guitar, or something small like that (I'm not sure what exactly this would be for you). When you accomplish something, it gives you some proof that you have the ability to do things, and that will help motivate you slowly to do bigger and bigger things.
It sounds like you’re doing drugs. If you truly want your life to get better, you need to get your self to stop. If it means getting help, then get help.
Ultimately, what in life would make you happy? What would you want to do if skills, expectations, etc were all no object? This can be a really tough question, but it’s worth it to spend the time really delving into it. Maybe make it your next project to figure out some idea of what your answer is. After you have ideas, come up with a tentative plan to move towards that. If what you want to do involves going to college, then that can offer some situations that can help with the skills, friends, and job aspect. You could move into a dorm room or with in an apartment nearby with some other students, which would get you out of your parents’ house and give you more freedom and more self-esteem. Going to college means that you have access to lots of internships that will give you experience and skills that employers will value. Even the fact of being a college student can help you to get a decent job now—I wouldn’t have the job I have now if I wasn’t going to college. Also, going to class and joining some clubs will give you opportunities to make friends. All of these things can help with feeling you’re moving in a good direction in life.
If what you want to do doesn’t involve college, then be willing to get your foot in the door at whatever it is, even doing menial tasks, which can lead to promotions and the job you actually want. Another thing is finding something to do even ifit doesn’t pay you anything. I’m not sure what you’re interested in, but search around your area or the Internet to find groups or activities or shows that are involved with something you’re interested in. Doing something like this will help you to feel like you’re doing something, it can help take your mind off of your depression, and it will give you opportunities to meet people who are interested in the same thing you are and maybe make some friends.
If something doesn’t work out as planned and you get more depressed, go back to my first two paragraphs and start from there.
I hope this helps in some way.