Sometimes when you're hurt, you want to shut out everyone and deal with it alone, but doing that rarely makes you feel okay. In a difficult situation, you become like a pigeon which closes its eyes when it sees a cat instead of flying away. It gets eaten because it forgets that it can save itself. The fear paralyses it.
Similarly, you can rarely snap out of it alone without anyone being there to shake you up and make sure you know you're capable of flying. There might be a small chance that because you've been in the dark for so long, your eyes might not be able to catch the flicker of light. Overtime it becomes your safe space. But if someone is nearby, that person can probably help you see it, not immediately but definitely.
Don't always keep refusing whatever help someone is trying to offer. You might want it from a specific person, but it's the feeling of that emotion you're looking for in the moment that helps you overcome it and the provider becomes secondary for a while.
You discover that stepping out into unfamiliarity isn't as bad as you thought it would be. That's how you feel better. And once you start feeling better you can get yourself out of this existential crisis you find yourself in. Your future self would surely thank you for it.