I think I understand what you mean. I think the main reason all of this started for me was because I recently got a tumblr. I'm a SJW now
I think that term has negative connotations for some people (SJW I mean), but that's probably because of the ones that are too touchy and go overboard.
Feminism has the same problem.
"Oh, so you hate men?" is what someone might ask me if I told them I'm a feminist. Eek!
In any case, regardless of how, finding one's self is always nice.
I have a bunch of very supportive friends. For anyone else, it's hard to explain what being aromantic actually is. They just think I haven't found "the right one" yet.
@sheepie: Depending on the adult, they'll call you confused no matter what age. I can't decide for you whether or not you should tell them or not. My parents don't know I'm aromantic because I know they won't really understand when I tell them. They just don't think people like that exist. However, that won't stop me from continuing to live my life in the way I'm most comfortable. A lot of people will never know what I identify as, but that doesn't mean I have to change myself to match someone's idea of what my life should be.
If someone asks me, I generally just answer with something...not incredibly specific.
"Do you want kids?"
"Not really. I don't like kids."
"When are you going to get married?"
"Dunno. I don't see myself getting married either. I'm fine just being on my own."
If they persist then I just make sure that conversation ends as quickly as possible.
I'm definitely not saying my way of doing things is they way to do things, either. You have to go with what makes you most comfortable. If telling them isn't going to bring about some terrible consequence, I don't see the harm. I just really don't think my parents will get it. I had a hard enough time explaining some simpler concepts.