Hi, Its Very Very Painful For Me While Having First

Hi, its very very painful for me while having first sex & it's like dying pain, I can't do it further. My partner still unable to enter his penis into my vagina because of my heavy pain. So I am scared to have sex. How we can have safe sex without much pain? Is it possible to enter his penis into my vagina within a day & how much time it will take? How many hours I'm bleeding once finished my first sex? What is the correct/right sex positions? Is that painful remains once after completion of first sex?
Thank you
I'm looking forward for your email.