How do yall cope with perceived inequality in relationships?

Hey everyone, first post here! So kind of a loaded title, but to be concise about it my gfs (27, 25) have been dating each other for longer than they have me— theyve been with each other for 6 years, ive been with them for 2. Whats more, i officiated their marriage to each other last year. I know its what theyre used to and maybe its greedy of me to desire it but I want to share a bed and a computer space with them, but my gf (27) wants to keep some separation between our spaces. We already live together and are planning on moving into a three bed, and theyre wanting to keep sharing those spaces with each other but put me in the master bedroom of the new place with my computer and stuff. i dont really like this, i want to share the spaces they share with each other too. But at the same time, i understand that this situation calls for consensus and so i'm willing to accept not being able to do that with them if it means we can still live together. I guess the emotional core of why I feel upset/saddened is that I feel like a lesser partner in a menage a trois and wish i stood on more equal footing, and i see the sharing of bedrooms and office spaces as a gateway to that. Any advice on how i can get over that or otherwise resolve this contradiction amicably?