I think the purpose for you is finding your purpose. You are currently in a depressed mode. So did I. I used to have a similar situation like yours. the lack of focus or attention doesn't prevent us from helping out other people. Therefore, I worked with a professor in the autistic lab in Vancouver, and I have this iOS project to help those kids with problems in anxiety. the problem of you is not about what you know and what you have learnt. the problem of you is about finding your passion and define your value. My suggestion is: list all your interest and locate the things you would like to do days and nights and you won't feel bore. next, find someone or some organization/company that is interested in what you do. and you will have a career :)