I need advice!!

So me and this guy have been sending nudes and flirting for the past three months and we always talk about how we don’t want to have sex until we both find the right person! Last night we were sending again and he then asked do u want to have sex and I go “are u fr?” And he goes “honestly yeah”!! Like I want to have sex with him but I know it will hurt because I can barely fit two fingers up my cat and I’m scared I’ll disappoint him:( but I want to have sex with him!! I’m just insecure!! Irk what to do!! Any advice? (We both just graduated his school btw)