Overpair minraised on the flop from OOP, oh my.

[STARSCREAM.]

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

BB: $34.45
UTG: $58.25
Hero (MP): $93.90
CO: $51.40
BTN: $69.45
SB: $9.55

Pre-Flop: T[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/heart.gif[/img] dealt to Hero (MP)
UTG folds, <font color="red">Hero raises to $2</font>, CO calls $2, 3 folds

Flop: ($4.75) 9[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $3</font>, <font color="red">CO raises to $6</font>, Hero calls $3

Turn: ($16.75) 3[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero checks, CO checks

River: ($16.75) 3[img]/images/graemlins/club.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets $12</font>, Hero calls $12

Very new to the table, no real reads on anybody, villian included. I am always lost in spots like these. So I hope to get a lot from this thread.

Help needed on every street.