PLEASE HELP ME :( I AM SO ASHAMED OF MYSELF?

okay so there is this guy (lets call him banana haha) that is my brothers best friend... well friday night we went over to banana's house to watch a movie (banana's sis is my bros gf) well banana had a date there with him and he was cuddling with her and i didn't care... well last night i went over to banana's house with my brother again and come to find out i was his date... well, like he kept trying to snuggle with me and i kept trying to get out of it.. (banana= very heavy (don't be affended PLEASE!) , not good looking at all, and no one i think "likes" him like gf/bf type) well anyways so my brother was like just do it.. so i was like whatever so i did... so then he had his arm around me, and then next thing you know he is holding my hand, rubbing my arm and my side, and back, and then i kinda got into it and snuggled up to him... he's a good kid and all but he's like my brother... and i am sick to death about last night. i told my mom and friends and they were like EW GROSS! and all...and to make matters worse he told my brother he REALLY likes me.. does the grossness fade away? how do i get my mind off of it? how do i tell him that we went over bored last night? how do i tell him i wanna be friends and nothing more gently?? I DON'T KNOW WHAT TO DO! help me please