I can relate! Like Ronan Keating sings: Life is a rollercoaster. We just gotta ride it :) Totally not my style of music, but he's got a point. You're still young. Things will sort themselves out as you grow older. I still have those days where I doubt and question everything, but it's happening less and less frequently, and becoming easier and easier to deal with. Surround yourself with loving and caring people, and read up on the Wim Hof method and CBD oil. Those practices have had profound effects on my wellbeing and stabilized my mood a whole lot.

Whish you all the best :)