As far as i know, asexual is basically sexual orientation. Not interested sex (except perhaps intellectually, kinda wonder about the experience) and that is how it has always been for me. I never became interested in girls or boys or anyone in puberty, and i don't think i've ever developed any kind of sexual or romantic attraction to others. I just don't need sex nor romance.
One impact, possible impact, is that i'm not sure i understand others who actually need those things. I know why, but don't understand it, if that makes sense. (I mean, can someone who isn't asexual understand complete lack of urge for sex? Works both ways, so this might not be a real impact but rather perfectly normal.)
I guess my issue is that i'm supposedly male (presumably since i'm biologically male) but i don't have any idea why that is. In the fundamental sort of way. As far as i can determine, the whole concept seems made up when i think about it, as it certainly doesn't really seem to be related to biological sex, based on that there are people for whom gender and sex most certainly don't seem to be the same thing. And so, rationally genderless/"i don't care" would be a better fit for me, though ultimately it would change nothing.
Strictly speaking, i'm not sure this is even important for me, but i like knowing things, whether they're about myself or not.
EDIT TL;DR "What is gender and does it even really matter".
EDIT2 my tldr isn't quite accurate as i reckon it matters for some, but close enough for me.