I don't feel like a part of my body

I'm taking singing lessons as part of a degree I'm completing and I'm struggling so much (like it's been several weeks and we're still working on breathing and opening my mouth) because I feel so disconnected from my body. I don't know what to do. A lot of the lessons I want to cry from frustration because my teacher will give me an instruction and I just can't feel it.

She's lovely and I almost feel like I need help beyond her scope because I don't feel remotely connected to my body. "Can you feel yourself breath in?" not really. "Can you feel your jaw release?" nope.

I don't know how to be connected from my body. It seems too frightening. The first time I felt sexualized I was 7 (?) I think, and since then I haven't wanted to have a body. I'd be perfectly content to be a head floating in space. I don't even recognize myself in mirrors most of the time, or in pictures from when I was younger. I don't know what to do.