I don't think these threads are healthy for you to keep making.
You seem fixated on the past which is understandable to a point especially if there is some trauma there. However what's done is done. If you are struggling to move on it would be worth seeing if you can be referred for counselling or therapy.
It is also an unfortunate fact that there are plenty of bright and 'gifted/talented' kids in a year group. It is expected of them (at least it was in my school) that all of them will achieve great things and go on to super competitive and amazing jobs.
The reality is not the case for a lot of those people. There is no guarantee that your life would be substantially different had you believed them about your talents. There is a glut of graduates and a lot of people with similar skills and qualifications looking for the same jobs.
Unfortunately (and I dont say this to be mean) you seem to lack your own initiative which won't help with things like education or jobs. Nobody is going to find you a job you enjoy, it's down to you to do that.
Teachers, Medical professionals and job coaches in a job centre can only advise and encourage. It's up to yourself to accept the help and support offered to make yourself happier within the confines of external factors out of your control (poverty, health issues, discrimination etc).