It's tough. Some nights are great - things seem to work, good hands and even mediocre hands hold up, you maybe catch a few lucky cards (turning your two pair, for example), and you win your coin flips. You come away ahead, and you feel like it's "so easy."
Other times, shit just doesn't go right. Like you, that was tonight for me. I couldn't get anything together in the $20/2 on Stars. I had good cards, but I never really improved w/ anything. When you miss most of your flops in the first hour, you're put to the test in the second hour, because you're short - which I was. I had to take a coinflip (which I hate doing unless I'm a big stack leaning on a smaller stack), with 88, and I was called by an average stack w/ AQo. Q flops, and I'm sent home.
On the cash game front, I dropped well over $150. When you have two full houses LOSE to better full houses, it's just not your night.
It happens... tomorrow's another day.