help please :(

so i have a boyfriend and we’ve been dating for about a week, he wants me to go round his house on saturday and i just know he expects me to do something sexual with him but i’m just not sure i’m ready to do that ( i’m 15, legal age where i live is 16) and i feel like he’ll judge if i don’t and if i do i’ll do it wrong and feel embarrassed.. what shall i do? realistically please, i really like him EDIT: so i just got back and it was absolutely fine we didn’t do anything as he respected what i wanted ☺️ so happy