first time advice and help needed

hi guys, 21f here & need some advice for the first time, i'm really struggling getting out of my head and just letting it happen with my boyfriend, he's been so patient with me and i would like to take the next step but i can't help but think about his past partners… he's had multiple and it's beginning to make me feel insecure in myself and inadequate for him. i think it's more i just feel vulnerable and it feels super embarrassing to be this age and still a virgin. he knew what he was getting into and has been patient but it feels like me being a virgin is becoming an inconvenience as he's getting no sexual pleasure from me & seems to be causing issues within our relationship at times… but i'm just so embarrassed i won't know what i'm doing & in my head constantly about how can i compare to his past partners or porn or other girls on social media… and will he be comparing me to them? really could use some advice, thank you 🙂