I think I’ve lost the ability to mask - help?

I think I’ve lost the ability to mask. In the past few months, I’ve been feeling really low, staying at home, stopping doing the things I used to enjoy—even food doesn’t taste good anymore. I stopped socializing with friends and people, and now that I’m trying to go back, I feel stuck. It’s as if I’ve lost the ability to pretend to be someone I wasn’t. I feel so confused. It’s like I want to talk to people, but I don’t know what to say or how to respond, and I used to! This is really confusing for me, like my old self has disappeared.

Yesterday, I was at a birthday party, and I couldn’t get the words out of my mouth. All the knowledge I had before about how to act or behave in social situations just vanished.

Like I said, this is very confusing for me—and new, too. Who is this new person who has taken over my body? And how can I get to know myself better? I feel kind of ashamed to be like this in front of people, but I just can’t pretend anymore. I need help because everything feels overwhelming. It’s hard to go outside and feel like I don’t even know the person inside my body.