Why bet/fold so much?

[paperboyNC]

Okay so I ran some stats:

Of the 30,132 limit hands I have in poker tracker, I have had called a river bet raise 108 times. I have won or split 38 times.

<font color="red">Here is my hand distribution:</font>
Four of a Kind - 1 time (won 1)
Full House - 10 times (won 6, split 1)
Flush - 10 times (won 2)
Straight - 10 times (won 2, split 5)
Trips - 11 times (won 5)
Two Pair -42 times (won 11, split 2)
Pair - 20 times (won 1, split 1)
High - 0 times

<font color="blue">Overall, calling river raises with just a pair has cost me $100 ($150 for 18 losers, $50 for 2 winners)</font>

<font color="red">Here is my opponent hand distribution:</font>
Four of a kind - 3 times (I won 0)
Full House - 9 times (I won 2, split 1)
Flush - 27 times (I won 2)
Straight - 20 times (I won 0, split 5)
Trips - 12 times (I won 6)
Two Pair - 24 times (I won 10, split 2)
Pair - 10 times (I won 5, split 2)
High Card - 2 times (I won 2)
Total - 108 times (I won 28, pushed 10)