My boyfriends packing a lot of heat!

So my boyfriend has a really large penis, and although I love it I'm beginning to think it's hurting me internally , after sex and sometimes during it hurts so bad and just feels like it doesn't fit!! We've been having sex for about a year now so I don't understand why I still feel this way! I don't want our sex life to change because it is bananas but I'm in pain myawlf and it's not fun ? Any advice ?!