You are what you believe yourself to be. Depression is horrible. I suffer with it as well. But at the end of the day your self worth is what you want it to be. society puts expectations on you to be something specific but that should not define you.
At the end of the day, do what you enjoy and focus on that because the worst case scenario is you "waste" time doing something you love.
Having depression I can tell you its really friken hard to stay motivated but I assure you no matter how bad you feel, it will get better and no matter how hard depression hits you, your not alone in that feeling.
My suggestion is to find a depression group so you can work on mental health and self love first. Once you have a handling on that move forward and do something you love.
Sorry for the long winded answer. I'm brand new to the board and your post struck close to home.