Yeah it's definitely a thing. I was always a petite gorl and I felt really insecure as a teen because I was so skinny. I pretty much hated my body and wanted to be bigger.
I legit think I have mild body dysmorphia tbh
I've been working out for over a year consistently now but every time I look in the mirror I still see the same skinny gorl
I'm 80kg (~176lbs) but I really don't feel like it.