Boyfriends ex girlfriends 😰

I struggle with the fact that my boyfriend has been with 4 of my friends. When me and him start to get intimate I have a hard time feeling special. Not because I'm not in his eyes but because I just picture him doing and saying the same things to them. I don't know how to fix it. I'm majorly in love with him and I know he loves me but I can't get myself to stop thinking like that :/ advice?