You're only 16 so I can't say for certain that you're asexual, because you haven't met enough people to potentially be sexually attracted to. Other than toward celebrities (which I don't count) I didn't experience sexual attraction for the first time until I was almost 21. However, it is possible that you're ace, and if you are, then please please know that you're not "not normal" because of it. We live in a massively overly-sexualised society, which has brainwashed people into thinking that if they're not a hypersexual horndog who wants to have sex 10 times a day then there must be something wrong with them, but it's simply not true. In fact, I can guarantee you that a lot of people, and particularly guys, pretend to be more obsessed with sex than they actually are just to fit in or because they're scared that people will think they're "less of a man" if they're not (which is absolute bullshit btw).