Every casino site feels rigged when you're losing.
I've won about $600 playing poker on Stake and even qualified for the Warm-Up Final, but overall I'm down around $2,000, mostly from playing Stake blackjack. Stake blackjack feels rigged sometimes too, but I can separate emotions from logic and understand that it's provably fair.
Honestly, I think your poker game has a lot of leaks that you don't recognize yet. I have plenty of leaks in my own game as well, but I'm honest about them and work on improving little by little.