Asexuality??

I think I may be asexual but I don't know. I'm only 18 so I know it could just be a phase or whatever. I'm not talking about the future, I only care about now. I've never experienced anything I would call sexual attraction. I can recognise if somebody is good looking etc but I never get that feeling of wanting it or anything that I think others do. My friends say I flirt with people or that they're flirting with me but I don't see it. I don't understand the concept of flirting or anything so I wouldn't be able to recognise if I or anybody else were flirting. I'm open to having an emotional relationship with somebody but i've never liked the physical side of it and i've never really been attracted to the idea of having a bf. If a friend asked me out i'd be likely to say yes but nothing would happen that was any different to the friendship we already had. I'd hug them maybe but nothing more and how I treated them wouldn't change. I'm worried i'm going to ruin all my relationship with people cos i'm totally incapable of recognising "romance". People would probably say I lead people on if my friend's interpretation of my "flirting" is correct but I honestly don't see anything wrong with it. I just treat people how they treat me and assume that's what a normal friendship is unless i'm told otherwise. I don't treat guys any different than I do girls or my brother. It also means I don't recognise if anybody is flirting with me so I'm completely clueless. I was talking to a boy for a few months once and only noticed he was interested in me when he asked me on a date. My friend read through some of our convos and was like "yeah you've been flirting for ages". I had no idea! A guy will mention i'm cute or send a x or something and I won't see anything significant in that. Should I? Does anybody have anything they can chip into this like personal experience perhaps? How do you know if you're asexual and how can I stop this from messing with my life so much? Thank you so much to anybody who replies.

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