Second time having sex ahhhhh

So okay a few months ago I lost my viriginity to a guy in the grade above (I'm in grade 11 hes in grade 12). So he texted me yesterday asking to do it again, but im fkn scared that i wont be good or its going to hurt again... And he usually likes girls going on top but he went on top of me for my first time but im just scared to do it again because ive never been on top and idk what to do on top...Can someone please give me some advice :(((