I've been thinking about all the things that are wrong with me
What do you think is wrong?
I think I'm not living up to my capabilities.
If you think you're not living up to your capabilities, you can ask others for advice. Otherwise we'd never know what we can improve on.
I'm fine I just think I should be doing better for myself.
It's good to recognize where you can improve upon yourself. However, you shouldn't see these things as being "wrong" with you, just areas where you can be better. You're always doing the best you can with what you have at the time.