How is it possible that everyone in the world is in a relationship and i'm not?

i'm not saying i'm soo beautiful but i want a boyfriend everyone has had one or has one and me i have never kissed a boy been asked out or someone tell me they like me i'm 16 years old!! i should have one by now? i don't consider myself to be super ugly but not beautiful either. I'm 5'9 approx, i have caramelish/brown skin. long black hair and i'm not the skinniest thing you have ever seen but i'm not super fat either. so is it me? i feel so left out with everyone talking about their boyfriends and ex's while i have neither :/. which makes me feel insecure and i ALWAYS compare myself to everyone else and think, if i was her i would have a boyfriend.