Friends had boyfriends, I had none

Hey, Im 18 and never had a boyfriend, i dont know if its me or that I have just never meet the right boys....
All my friends in school had/have a boyfriend, I had a few online chats or dates but it never lasted more than a few weeks.Im very shy and bad at speaking thats why it gets uncomfortable.
When I was younger i was very big/fatt( sry dont know how its in englisch) thats why I am self conscious and i know now i look bether than before but when i look in a mirror i see my old me
Some friends tell me a boyfriend comes natural and I have to wait, but when I see them together cuddling or kissing i get jealous and just want what they have....
I hope my englisch isnt so bad ╥﹏╥