My boyfriend mentioned many times that we should get a room. I don't want to go because I'm too young, but I don't want to disappoint him. How can I politely refuse?

Can't go, if he must go, then you should break up with him quickly, because maybe pregnancy and abortion are too harmful to girls' body and mind. I would rather break up than do it. The skin of the body is not damaged by the influence of parents, and filial piety begins. Love yourself, your boyfriend. I never gave birth to you, raised you or married you. Why? Come to your senses. If he doesn't respect you again, he has this selfish request. All you have to do is tell him to fuck off and get as far away as possible. Not uncommon.