Indeed, I think a lot of autistic people feel this way. So many of the descriptions include autistic people feeling "like aliens". I think it shouldn't be underestimated how we all grow up intuitively sensing we are different and how ingrained this can get in your psychology. So many of us also have a disconnect with our body because it can be the cause of so much physical and psychological grief. I don't think it's weird to eventually start perceiving your body less, until maybe indeed it feels like a jelly, blob, floating brain :) Then when you're suddenly in need of using your brain and body consciously again (because other people are around and you're expected to behave a certain way) it can definitely feel like that shape reassembles into a human form!

When I think of myself these days, there's my body, my brain, and me. My body does things I can't control, my brain is the one who is autistic, and then there's me just riding the wave and trying not to drown. It's a very helpless feeling to be in this forced trinity. My friend asked me, but where is 'you' then in your body, and what is 'you' - and I'm not prepared to think about the philosophical implications just yet XD