one of the main reason you feel depressed is probably because you don't know where you're going
the way I see things is men always had to keep themselves busy, follow an objective. this is what we were doing when we were chasing food, spending time to stay alive
then we got sedentary, developped a lot and today you got a home and parents that give you everything you need, so you wake up in the morning with no goal, no objective, not knowing exactly what you'll do nor having any long term plans
men need to have an objective, they need to stay busy otherwise the mind goes crazy (for me at least), so my advice is try searching for what you want to accomplish in your life, short term goals, long term goals, and spread them out on different topics... sports, knowledge, finishing a book, jerking off 10 times in a single day, whatever it is, find something that gives you excitation and start from there. when you'll reach the first goals you'll realize that you're not worthless and that you can do it
again this is my point of view, may seem stupid to some people and may makes sense for some others, either way
"we're all gonna make it brah" ~