My partner (24M) and I (22NB) have been together 4 1/2 years, dead bedroom for the last year and a half, is there anything I can do?

I guess i’m looking to vent and seek advice. We’ve talked about it several times, he knows i’m not happy. this is the person i want to marry but i can’t live like this for the rest of my life. we’re in our early 20s but it already feels like we’re in a complacent old marriage

i do everything i can to try and be the best i can be for him. i cook, i clean, i take care of our cats, do our laundry, i got a degree and i work. i try to compliment him, flirt, hype him up. i shower, shave, smell good, dress up, wear cute underwear. try to touch him, kiss him. but i just feel rejected

i’ve taken him out, worn nice lingerie, tried to get him on top of me just to hear he’s not interested at all

he insists nothing is wrong. he’s not depressed, i haven’t done anything wrong, he’s still attracted to me. i know im not ugly but i look in the mirror and just see all my flaws. i don’t feel desirable at all. maybe it’s stupid to be so caught up on this, everything else seems so perfect. he tells me all the time that i’m beautiful, that he loves me. he supports me, does everything for me. he’s been looking at engagement rings, and we’re both in 100%. it’s just hard to say i have no reservations if this is going to be what it’s like forever. two years ago he couldn’t take his hands off me. i don’t know what im doing wrong

we still kiss and cuddle, it’s just hard to feel like he even likes me when there’s no passion or desire behind it.

he’s agreed to go to the doctor to see if there’s something medically wrong but he’s never followed through. i’m worried about him, i’m worried about our relationship, that i’m failing him. but he insists there’s nothing wrong

i don’t know what to do. my self confidence is in the toilet and i’ve been so depressed and insecure. it’s been a year and a half.

today’s his birthday. he’s at work and i’m about to go out and get everything i need to celebrate him tonight, but i’ve spent the whole morning crying

tldr: been together 4 1/2, used to be unable to keep our hand to ourselves. now he doesn’t touch me at all, and i don’t know where we’ve went wrong