Kicking addiction was the first step to me for feeling better. It's all about confidence and believing in yourself. If you don't believe in yourself you can't quit. If you don't believe in yourself you will feel lonely. Go work out, get a job, try to talk to people even if it is just simple chit-chat. Once you feel more confident you will also be able to take more decisions with confidence.It doesn't have to be an endless cycle. You just got to break through at the part where you feel the most sure you can beat it. And the rest will follow.