I felt very similar to you at one point in my life. Like most people the reason you are depressed is because you have a idea/vision of what your life should be

I felt very similar to you at one point in my life. Like most people the reason you are depressed is because you have a idea/vision of what your life should be like and because it isn't that way, it is upsetting you. We are products of our rituals/habits. To change my thinking and spawn out of my depression I realised I had to take consistant action. So, now I spend an hour every day working out and another hour listening or watching something inspirational. Then, I start my day. I would highly suggest you watch some of Tony robbins' seminars on youtube.