Noob to cash games

[Ducatisti]

Ive been playing mainly SnG's for the past year or so, and more seriously over the last 4 months. I play $20 SnG's at an ROI of 17%. I recently decided to play cash, as most people seem to say that this is were the serious money can be made. Even though I was rolled for more I decided to start of at the $50 NL, then moved up to the $100NL. Things were going quite well at first, over $600 up in approx 2000 hands. Unfortunately over the next 10,000 hands im down a couple of hundred and my win rate is -1.27ptbb/100 over a 13000 hand sample. Now I know this is a very small sample but what do you guys think of my stats?

VPIP - 19.5
PFR - 9.36
AF - 2.32

Im not entirely sure were im going wrong or if its just variance. Do you think Im too tight? Not sure if its wise to stick at it or go back to my comfort zone of SnG's, but I would seriously like to crack this cash game. I think my main weakness is getting outplayed on the turn and river.

Any comments greatly appreciated.