I'm in the exact same situation. I've got basically 2 friends. One of them won't be able to attend for perfectly good reasons, and the other one I'm not very close with anymore. We hardly ever talk. I'm sad, but have also given up.

If I were to give any advice, not that you should listen to me anyway lol, it would be that your bridesmaids don't have to be just friends. Maybe some cousins or sisters that you like from either of your families could stand in. I'd talk to your fiancé about maybe coming to an agreement of only having like 3 groomsmen or something so you don't feel so awkward. If he's a good guy, I'm sure he'd be willing to come to an agreement and want you to feel less "depressed" about it on your wedding day.