I have a friend who seems to have been in exactly the same situation as you.
She is in 40 now and quite happy. As soon as she was able to she left home and hasn’t looked back.
Sometimes parents can just be horrible people. And that’s because being a parent doesnt suddenly transform into a loving and doting parent. Sometimes they have favourites.
Only you (or someone who knows your situation) can tell us if you are being a petulant ungrateful brat or your parents are tyrants.
Either way, stop whining and make your own plans for your future.