It sounds like you're having fish draw out on you successfully. There are several responses to this event.
Some people erroneously feel that the table is an "any two will do" table, so preflop hand selection is just a waste of time. They loosen up their standards and start playing anything they get, hoping to win with better play. The real winner here is the rake, since nobody can crush the game consistently if they're playing any two cards.
Others get despondent over being drawn out and decide to move up in stakes to a place where people "will respect my raises." They mistakenly feel that a 10/20 game would be easier than the 1/2 game, since they can more successfully bluff, and since they won't face the miracle outers on the river. This thinking is the second-best way to lose a fortune in a short period of time. (The best way is to become a Scientologist.)
The fact of the matter is, we have a love-hate relationship with the fish, calling stations, and donks. They feed the pot, they call relentlessly with no hope of winning, and they pay off time after time when it's incredibly obvious that they have no hope of winning: for this, we love them. At the same time, though, they've usually got SOME miracle that will give them the pot. Maybe it's a runner-runner nut flush. Maybe it's a double-gutshot straight. Maybe it's a miracle two-outer low set. Maybe it's the three-outer reverse-counterfeit to our (shared) top pair. When they hit their miracle, the bile rises in our throats and we feel the frustration at the profound unfairness of it all. It's at that time that we really want to just walk away from the table and do something -- anything -- to prevent ever getting drawn out on again.
These draws are wonderful! They put money in our pockets.
Hypothetical example: you've got A K on the button. three limp to you; you raise. six see the flop:
A 8 6
Our donks have the following hands:
ATo, who draws to the three-out winner.
T7o, drawing to the four-out gutshot straight.
Q2 , drawing to the runner-runner flush.
44, drawing to the two-out set.
33, drawing to the two-out set.
Now, the field has about 12.5 outs against you, which is a VERY strong draw. If all five of these opponents go to the river against you, you're going to lose this hand about half the time. And WHEN you lose, it's going to be to a miracle card. That's frustrating as hell. However, notice that you're going to WIN about half the time, and when you win, you'll be getting a 5:1 payoff.
Add better draws to the opponents and they draw out on you even more often; however, remember that if you win this hand just one third of the time, you're making a killing.
When you lose to a miracle river card, swear loudly at your monitor. Throw a pencil across the room. Tap the screen menacingly. Then type "NH," ante up, and beat the snot out of the moron on the next hand.
Stick with it -- in the long run, donks are your best friends.