sex....

i am 14 and 15 in december and guys always bring up sex. i've only made out with a guy before. i am very curious and wonder how it feels but i know i'm not quite ready for it. i also want to wait for the right person. the only thing is there is this guy i used to talk to and tomorrow i'm going to hangout with him at a house and i'm scared sex might be brought up. is it bad i i have sex with him? i mean i know things happen in the moment and i'm scared it could happen.