I have the same thing. I didn't even say that I was asexual (I didn't know the word for aromantic at the time) and I was immediately shot down by my mother telling me that "I just had to wait until high school/college" and that I was a "late bloomer." She still constantly talks about when I get a significant other (referring to them as the opposite sex, of course). My Dad would laugh it off, as he already thinks I'm too young for romance (despite the fact that my friend has a boyfriend and most of my friends talk about it constantly). I just gave up a while ago, and while I'm out to most of my school friends, I try to get them to stop talking about it in front of my parents.