Anything that makes you uncomfortable is a valid concern. Have you told your mom how uncomfortable it makes you feel? Tell her that you don't want any massages - that's a totally normal thing to request. If she argues with it or tries to guilt you, ask her if she wants you to be happy - and then tell her that not being touched makes you happy.

I'm sorry that your mother is behaving so inappropriately. Stand your ground and stand up for yourself. There's a difference between respecting your parents and being abused/taken advantage of by them.