What Should I Do About Me And My Girlfriends Parent Problem?

Well Not exactly a problem here's the thing she told me her mom likes me but she wasn't suppose to tell me that but somehow I always upset her I called her Mrs.Moran instead of Mrs.Perez she got mad, I held her daughter by the waist she got mad I Didn't think her for te ride when she drove me home from the movies and she got mad I try my best to mind my manners everyone tells me i'm the nicest boy I ever met her mom does like the fact im 6 foot 1 and shes 4 foot 11 tho and im 14 so try to keep it PG