It makes no sense for it to be a simulation like a computer simulation. It’s a simulation like a dream is a simulation. Everything in the universe you observe is you. Waking up from the dream is realising this, and realising nothing exists, just being.
Like a dream, you are just me. The floor I walk is me. The air I breathe is me. Everyone I meet, everything I feel, is just me. Nothing is real except I.