recently I've felt very depressed, I feel like I don't know myself anymore. I feel hallow.

I feel like I am not myself anymore. I go to school and I have people who I am friendly with but I still feel absolutely alone, like I can never relate to this people, they all care for their short term pleasures and other shit I don't care for. And I feel like I'm wearing a mask out of some weird primal fear of social rejection, and so subconsciously I've created a fake person that interacts with everyone at my school. But I would also say that there is a true side of me but it feels lost like its hidden somewhere deep in my psyche, even now where I am alone in my room, it doesn't seem to come back. Is this ego death or is this something bigger?

this is a cry for help, I have nowhere/nobody else to ask for help. and I feel like I'm at the end of my rope. I feel numb