All my friends said that if they were in my situation, then they would go with him and my mom said that its my obligation as his girlfriend to go with him.
Don't listen to your "friends", and don't listen to your mom either. That idea, that the girl's wishes have to take second place to the boy's, is just plain nonsense. This is 2017. You are under no more obligation to go with him, than he is to go with you. No more. No less. These "friend groups" sound like a kind of tyranny or dictatorship. You don't have to be their slave. At 16 you can start to choose for yourself. If your boyfriend dumps you or your "friend group" rejects you, then you can still say to yourself, "I did what I
wanted to do, and they can just suck it up". You'll soon get a newer and better boyfriend and friends.