Is this too much for a 14 year old girl?

Quite honestly, you sound like a slave. Do your chores...that should be expected, but don't let your mom trick you into thinking that serving her breakfast in bed, giving her massages and cooking dinner is a chore. Those are extras that she's soaking you for and you should be paid accordingly. Some of these things shouldn't count as energy consuming. Like getting dressed for example, it's effortless, same as making yourself food, it needs to be done to keep yourself alive. Once you cut the extras out(catering to your mom) then these self preservation acts will seem a lot less demanding. I know going to a private school can be costly, but that doesn't mean you need to be a slave. I'm interested in knowing if it was your choice to go there or your mom's...sounds like she may be using it against you if it was her idea.