i think i feel wings on my back, but i’m not sure if it’s just me wishing for them. it feels like this heavy sort of shapeless ‘presence’ on my back, and i always want to reach back because it feels as though i could touch them (obviously, they’re never there). does this sound like astral limbs?

This does sound like at least the beginning of astral limbs, anon. However, if could also be ‘normal’ back pain. if you have a large chest…

I sort of have a problem? I think I’m otherkin, in addition to my fictionkin-ness. There’s these weird weights on my back and tailbone, and my mind keeps saying ‘don’t sit there, you’ll cramp your wings’, or I’ll involuntarily sit in a weird position so I don’t hurt my tail. I’m not sure, though.

It sounds like you have some phantom/astral limbs anon! They may or may not be related to a kintype. (sometimes limbs like these are related…