Neutrino, I don't think your IQ matters at all. If you read something about some else's experience and it resonates with you and helps you, then more power to you.
It is so so common to have the sorts of issues you're having now at this stage in your life. I know I and most of my friends did.
Are you getting treatment for your mental health issues? Medications, talk therapy, CBT, hypnosis, meditation, etc... there are many many strategies that can really help you feel better and function better.
Is it possible to take a break? I don't know where you are education-wise, but it sounds like maybe you're doing a phd, which is so stressful. I had several years of stops and starts and drifting due to similar mental health issues. But bit by bit things came together, and I am now generally a happy person. I get stressed and feel I can't cope from time to time, but I'm pretty satisfied by the small things in life and confident in myself. But it took being a basket case for the first half of my 20's, then getting my footing for the second half, so don't feel you're useless or a failure for not seeming as together as people around you appear to be.
