playing top pair (or any pair, for that matter)

This is my first post here about poker. It wasn't until today that I began to understand all of the abbreviations you guys use [img]/images/graemlins/smile.gif[/img].

Anyways, what is you guys' opinion on playing top pair after the flop? I'm always scared to play it, since it seems like someone always comes back at me with a bigger hand. Looking at my Poker Tracker statistics, I'm a winner in every situation except playing single pairs. In fact, my losses with one pair are greater than my wins in every other situation.

Here are my one pair stats:

total: 317 (of 739 total)
saw flop: 99
folded flop: 27
folded turn: 71
folded river: 14
went to SD: 33
net loss (total for one pair): 9.48
net loss (when didn't fold one pair): 1.46
hands won $: 15
won % at SD %: 33.33
% of total hands: 42.90

So, it looks to me like I don't play it enough... but on top of that, I must not be playing it right, since I lose either way. Is there any way, within poker tracker, to find out how many hands I would have won w/ a pair, had I not folded them?

FYI I just started playing on Royal Vegas Poker last week at the 0.05/0.10 level... so I don't know if the stats mean anything yet.

Thanks in advance!
Justin