thoughts on sexual relations?😩.

so i’m 15 & my boyfriend is also 15. we were started talking at the very end of april & got together mid june. i’ve known him since 6th grade so it’s not like he’s a stranger. i know that he wants sex, and of course i do to but something inside of me is scaring me & i’m not entirely sure what it is. he asks me what i’m scared of & i don’t know what to tell him. like i want to do stuff w/ him but i don’t want him to think i suck at it or not enjoy it. any thoughts on this? tips? tricks? am i getting too worked up about this? anything helps really😢.

edit 07/11/19;

-so today him & i made out & it was pretty great, you know, he was on top of me, between my legs & we were kissing constantly. & i know that he wants to be sexual obviously after reading above. & i’m okay w/ certain stuff... so we’re kissing & he moved to my neck, then moved down a little lower. he moved my shirt up to a point where he knows i’m okay w/ it & looked me in the eyes & said “can i?” 🤤🤤 my heart melted & i said yes, wanting more & we did a little more 🥴🤭. but when he looked at me & ask if i was okay w/ more 🤯🥴🤤🥵. i was 💦💦.