G-Spot/Vaginal Orgasm

So I've been having sex for 4 ish years. The first 2.5 years I never finished at all. After that a couple times. My current boyfriend and I have been dating for about 4 months, and he has been amazing at making sure I finish. He's great. But he wants us to try to finish at the same time... Meaning a vaginal orgasm. I've explained how Ive never done it, but he's determined to make it happen. He says we just need to find my gspot, and through all my experience with sex & masterbation I haven't found it. I'm not mad at him I just want to be able to get my body to relax & do it. Any tips would be amazing!