first time

hi so I'm 15 and I have been dating this guy for about 2 years and we recently have been talking about having sex for the first time. I'm ready and I know he is ready, we are both very comfortable around each naked so I'm not worried about that. but I have a very tight  vagina like if you tried to fit 2 fingers in me I would scream in pain so I'm very scared on how it will feel. any advice