I want to have sex but I’m scared

I’m f26, and I want to have sex with my bf. I have tried to have sex with him a few times but it hurts so much. TMI but it’s almost like he can’t get passed a certain point of skin and it’s an intense sharp pain. I cannot seem to relax my body so I tense up and it hurts 10x more. I need advice on how to relax my body, or any positions that are not going to hurt as much. We have tried missionary each time. Help please . Any advice would be helpful