So I've had this question forever and dont really know whom to ask. I'm a 24 year old cis and (as far as I know, heterosexual woman who is a little bicurious but isn't sure).

I've always felt kind of like my body isn't mine. Like when i look at the mirror or pictures of myself when I'm dressed real fancy with makeup and shit, i see a girl but it doesn't feel like it's me. I've never completely felt like a girl...more like just an entity in a body i guess? When i was little i used to describe it as feeling "like an alien." I also have these times when I'm with a group of really feminine girls and i don't feel feminine at all. I feel very masculine? But around guys I'm dating/really like, i feel extremely feminine. It's very fluid and changes according to whom I'm around. Really don't understand what this could be. If someone could perhaps guess or has experienced something like this and knows what it is, could you please tell me? I'd be really grateful!