Could be depression?

I would say with the tone you are describing your feelings with it can definitely be a sign of depression. My boyfriend went through something similar when he was laid off of a job that he loved, he felt very hopeless and that he just wasn't making any progress in life and felt that he should be achieving more. It is common in life with its ups and downs, but if you are feeling overwhelmed I recommend going a professional so they can help you with these thoughts and feelings. Hope that helps and good luck.