Proud virgin

Tomorrow I am going to have sex for the first time with my boyfriend/guy best friend. He is not a virgin and he feels very blessed and honored that’s he’s going to be my first. Now, I am extremely nervous on what to expect in terms of what he thinks about my body (I am insecure about the way my body looks)? Pain? If the condom breaks? If we do use condoms do I still need to get/take a plan b? Do I need to quickly hop in the shower when we done😂? I’m honestly paranoid and nervous. I may chicken out or I may be doing too much. Idk. Someone tell me what it is and what it ain’t!!