I'm sorry that you are struggling to find your place in the world. I think life is not a simple plan for most of us. I guess the dream job to be something that I enjoy doing, so it doesn't feel like work so much. Find what gives you joy, and then figure out how to have a career involving that activity. Taking a class seems to help people along a career path.
When I'm really depressed, I force myself to be grateful for everything. I really take a deep look at everything in my life and give thanks for that. Even giving thanks for my sadness because without that, I couldn't really know how awesome gladness feels.
I wish you a smooth ride ahead, and I think one day you're going to look back at this struggle and see how meaningful it was for your growth.