it actually hurt

So last night i had sex with this guy who i met at this bar i go to every week hes a new worker there... when you have sex with someone enough times your vagina will form to that shape as you get aroused, well i was having sex with this guy & i mean he's the biggest guy ive been with & hes very rough so these probably have a lot to do but it but it hurt like for him to go all the way in was like too deep especially in doggy or when i was on top. I want to know how to fix this since my vagina isnt used to him it's used to someone else