okay so how d'you know if you've experienced sexual attraction?

Your 13, mate calm down. It's a pull, it's a fixation, it's arousal when you feel close to them. Its all these things. You literally cannot be sitting there at 13 worrying about this - it's a waste of time. I would say that I hadn't felt it fully at 13. Certainly I'd never known anyone who I had some strong desire to er "frickle frackle" with haha. Calm down, go to school, make friends, live.

 

It's if you want to have sex with someone/feel arousal toward someone. And here's the thing. It doesn't have to be toward a specific person. If you fantasize about men or women in general and love the idea of sex with women or men in general...you are feeling sexual attraction, even if It's not toward a specific person. Not all sexuals are sexually attracted to random strangers, some can only feel it within deeper connections. But a true asexual would never enjoy a random sexual fantasy/want to act on it in the future at all.

 

For me, attraction towards a person comes in different varieties. The one I have experienced most often is the urge to look at a person. Like, literally not being able to take my eyes of them and feeling nervous because I think they will find out that I'm staring. This also occurs with strangers and varies in strength.
Another type is wanting to spend as much time as possible with someone. For me, that one is difficult to distinguish from platonic (friendship like) attraction. I sometimes even get it mixed up. I think that's mainly because I have only started feeling attracted to people slightly more than a year ago and realized that I am attracted not only to men just three weeks back.
So take your time and don't pressure yourself to feel something. I am sure you will eventually find out what being attracted to someone feels like for you.

 

I'm with SHACH. Cool it. The mere fact that you're thinking of this means that it's worrying or confusing you. However, you have a long way to go, to learn, experience and fully grasp it. A lot of people here can describe, tell you but that's all. Enjoy your life, friends and other stuff. Things will come to you naturally and it is more exciting that way.