+ or maybe just fear of an unknown. and also i…

+ or maybe just fear of an unknown. and also i'm fine with being physically close with member of my family)not in sexual way of course), idk if that fact matters

I know this is a complete non-answer and doesn’t help at all, but the only one who can answer this question is you. Remember that it is totally ok to identify with 1 identity now and another identity in the future. This could be because you feel differently in the future or maybe you just identify more with another label. The point is, don’t get too bogged down in thinking that you have to make the ultimate decision now and that you will be stuck with that label forever. 

According to http://wiki.asexuality.org/Demisexual, demisexual is a person who does not experience sexual attraction unless they form a emotional connection. It’s more commonly seen in, but by no means confined, to romantic relationships. The term demisexual comes from the orientation being “halfway between” sexual and asexual. Nevertheless, this term does not mean that demisexuals have an incomplete or half-sexuality, nor does it mean that sexual attraction without emotional connection is required for a complete sexuality. 

So the main difference (and this is just my personal interpretation) between demisexual and asexual is that demisexuals can experience sexual attraction but only if there is an emotional connection (and I assume this would be rare but again, it would depend on the individual).

By the sounds of it, you seem to fit more into the asexual category right now but this could change in the future. If you feel that you possibly could feel sexual attraction to someone if you established an emotional connection, then you are probably more demi. It really just depends on what you feel more comfortable with. There really isn’t a right/wrong or definitive answer.