Like you, I've been keeping my eyes peeled for FCs and players to RP with for a little over a year now on Mateus with basically no luck (tl;dr grass is greener on the other side, matty's no better than balmung in this respect) but generally speaking I only have myself to blame for it.
I'm picky about what I want, the vibe I'm looking for, the themes I'm after, and very few people have "clicked", as it were. On a positive note, the few people I *have* found are great writers and have not a care in the world that I play only lalafells or do 95% of my RP on discord.
It's not wrong to want something done a certain way or to just have a different vibe from everyone else. Just means that you have to work a lot harder to find samesies. It isn't your luck; you've done nothing "wrong"- the game is just not the place you thought it was. Adjust your expectations, get creative with how you put yourself out there, accept that your friend group will be small, and things may start to feel a little better. ^-^