SHOULD HE BE MY FIRST?...WANT GIRLS TO ANSWER..BUT ESPECIALY GUYS?

well ok..so my best friend who is also my first kiss n was also my first boyfreind..we knew each other for a long time now..we helped each other out with ex boyfriend n ex girlfriends..n we been through alot..we messed around on n off but still are great freinds..whn we going out which was a while ago we tlked about ...now im a virgin n hes not..n we were planning on him takin my v card..n now we start tlkin about it again n i really want n so does he but idk if we should..also im nervous about doing it even if we are hellah koo..also i feel im too fat cuz i have really big thighs LIKE SIZE NINE but small waist n SMALL stomach HE SAYS IM NOT but guys always say were not but idk..my question is should he by my first