It's beatable. Sometimes it gets extremely frustrating when luck goes against you, but if you keep your wits and don't spazz out, you'll be a winner.
I've had some incredible bad runs and screwjobs against me, but I still have a winning record every site I've played. Just don't try to overthink.
I've looked up the records of some of these mofos that've cleaned me out with 3 outters and BS like that, the worst of them have lost THOUSANDS of $ at 4NL. You would think they've know enough that they suck or need to change their game, but nope. The key is that stupid people don't know they are stupid. Someone has gotta been winning those thousands from them, no?
Be honest with yourself, if you can't beat THEM, maybe the prob is your game. You need to adjust.