How to deal with having a way more experienced partner

As the title says my boyfriend is far more experienced he has had one night stands, casual sex friends with benefits long term girlfriends he is older and I understand he had fun when he was younger but recently its been getting me down. I was a virgin when we got together but nothing we have done whether physical or in general is a first time for him. Sex wasnt a first time for him, certain acts were not a first time outfits were not a first time, places were not a first time. He never mentions his exes although he's told me what hes done and where and whenever we have tried something new for the first time he just seems really unenthusiastic and I know its because hes done it all before. I wanted him to want me and feel excited but anything ive tried like ive said sexy underwear, trying new things he just doesnt seemed fussed about, the other weekend when we were out in the car i tried to initiate something just to try do something new that he would remeber it being with me but he rejected me saying he'd done it with his ex I just dont feel very special he has done everything whereas everything is a first time for me and a big deal its not for him, when he thinks back when hes older of doing these things it will be to other girls he did it for the first time with. Even outside the bedroom department its the same things like going places for dinner, going to visit friends going on a night out or going on holiday hes done it and just appears to be uninterested. I know i shouldnt care his past never bothered me before but now it does alot and its making my self esteem crash as i feel like nothing i do will ever live up to these other girls

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