What caused the instability of the mind? You can think for yourself first, whether it is a realistic problem, an emotional problem, a life problem, a worry about the future, or a confusion about your own lack of ability. Find the reason, then change yourself and improve yourself.
If you have tried many methods and nothing has worked, then I suggest you tell me the details so that I can help you analyze them in detail. Or do a basic SCL-90 psychological test to see your state.
All the students in our school have counselors. You can also talk to your counselor.