How in the world can you possibly win at Micro Limits?

I am playing the .50/1.00 tables at pokerroom and I keep losing on the turn and river. There are usually 4 or 5 people who pay to see the flop and then inevitably 1, 2 or possibly 3 will call all the way to the river hoping to hit the miracle card. More times than not one of them gets lucky. I can't tell you how many times I have lost with KK and AA to a straight made on the river or three of a kind made on the river or two pair made on the river. What am I doing wrong? I will lead out when I have the best hand and 2 or 3 others will call all the way to the river. Sometimes my hand holds up but most of the time it doesn't. How do you win when there are so many players that call all the way to the river?