Not losing virginity before 19 is socially acceptable?

My grade 11 and 12 classmates started losing their v card at around 14-15, even some have lost it in grade 8 and 9 and have has sexual experiences (oral, fingering) since grade 7. Everytime we get together in a group I feel like I'm the odd man out. I try to join in but I feel like everyone is looking at me as the weird one who still hasn't experienced such a fundamental thing.