I could easily have ended up like that. My mother was dreadfully upset when my sister didn't return home after university as she had - she had expected her to move back home until she got married. By the time I went away my mum said she no longer expected it, but did very much hope for it. It didn't happen.
Like @Madein1995 my mother did far too much for me for too long. I, too, was at least 10 when she would still choose what clothes I wore each day. She would always cook and clean, I was barely allowed to do anything. I had pets, but wasn't allowed to do anything for them except feed them occassionally. So much so that when I said I was getting my first rabbit as an adult she seriously questioned my ability to look after it, despite my having had pets all my life.
She hated me spending time in my room - she wanted me in the lounge with her, watching whatever was on tv. I was allowed to choose sometimes, but then she'd moan. She found a house for us to move to when I was about 24 - she tried to sell it to me that I'd have my own lounge as well as a bedroom - I queried if I'd ever be able to use that lounge. She admitted no.
Again, in my 20s, when staying with her one summer, I wasn't allowed to accept the job I'd been offered as it involved work on Sundays, and 'You have to go to church on Sundays' - this despite me having tried to tell her I was an atheist for many years.
It only takes a weak will on the part of the child, guilt to look after the parent and, maybe, a touch of laziness and it's easy to fall into this trap. But you're right, OP, it really isn't healthy.
Look up enmeshment. I suspect that may be coming in to play.