How to stop feeling hopeless and dead inside at 21?

I genuinely don’t know how to bring myself to work towards some kind of higher goal or something. Yesterday I had the time of life trying to begin a book and today I feel dead inside and empty again. It’s like this constant cycle where I find myself lost and overwhelmed. Worrying about the lives of other people who much better off than I am.

I just sit lately and ask “why bother, what’s the point. Everything has been done before, I’m not special, I won’t make it”. It’s exhausting and unhelpful. I don’t know how to stop. I want to have hope for my future. Well I mean at least now I do. It took a while to even believe in the concept of me having a future. I want to be able to afford my own place on day. But I’m just so stuck and broke, I have no idea what career I want. My current job doesn’t make enough consistent pay. I’m just so sad and exhausted with myself.

I don’t know what to do. How do you get past this feeling. I feel like I’m already 50 at 21.