Your best bet with this sort of thing is to have the patience and keep trying, to either find one you like or create your own. It's hard to get a roleplay started and get it going here on FeralHeart, but it is possible and quite rewarding in the end. And there are quite a few active groups running around, you just have to wait and catch them. I know this probably isn't particularly helpful, but it's about all you can do with these sorts of things. ^^
As the others stated above me, it's about patience friend ~!
For all we know there's a roleplay group in the making and they're getting their final touches in o:
You can always check the group advert boards and look around there if you can't find any that are to your liking in-game.
I wish you luck on finding that special group for you to be a part of though ~!