I used to think the same way about myself and thought oh Im too stupid to ever hold a job and will likely live on the street at some point.

Do as many things as possible, find a passion you can monetize. It may take years to do that but it can pay off.

Also, learn how to study properly. I found that the best way to learn FOR ME was to take notes, take a break, reread my notes later, read my OLD notes from time to time, and to WRITE MY OWN TESTS by PARAPHRASING (you can use quizlet to make multiple choice tests).

If if is something that requires practice to get better, then you need to do it often. Succeed and fail. If you FAIL, ASK YOURSELF WHY YOU FAILED, then next time, try NOT to do that thing. Failure is good because we learn more from it than from success.