Painful Sex

So i’ve been with my boyfriend for 9 months now, and we have only had sex about 8-9 times.. It’s basically nothing and i really want to do it more... but the sex is insanely painful so i hate doing it 😩

I was assaulted when i was 16 and im pretty sure my main issue with sex in anxiety around it after that incident, but i can’t seem to get over it and enjoy the sex?? my boyfriend can’t even get in all the way before i want to cry (most times i do cry because it is so painful and i’m so stressed even though i’m trying to relax the whole time)

Had anyone experienced anything similar??

How do i make the sex less painful ???