Do you think he was looking at me the wrong way or am I overreacting?

Today I got picked up from my classes and got dropped off at home by my mother and her boyfriend.He asked me if I had any diapers on and I’m like “Um,no”.Then my mother says,“You getting a butt, and that’s good”.But I’m wondering to myself,why is he looking anywhere there and also I didn’t have on a tight,tight jeans,it was a little bit ruffled like but just a bit tight too.Should I tell her how I feel? I don’t want her to get mad at me because everytime I say something about him, she says I’m just complaining or being rude when sometimes he bitches to her when I tell him “what you looking at stop it!”

And also I never told anyone this but about 2 years ago me and him was just watching television and all I said that my back is aching and he offered to rub my shoulders but then he told me to lay my head on a pillow on his lap,he used some moisturizer and then rubbed my whole back under my wife beater and this was when my mother wasn’t home.I didn’t say anything and I was afraid what would happen.He seems like a nice person but sometimes I think he gets to friendly to the point somwtimes giving me wierd look and one time tried dancing with me(not in sexual manner though).I’m 18 now and I really feel like moving out but I know my mom won’t let me go on my own.