$100 nl - river steal raise

[PokerNewbie]

Hero is new to the table, 4th hand. Villain is 20/12/1.5 over 40 hands and is a card runners member.

Does my action look like a straight? Or is this total monkey FPS spew? Do I make any better hands fold?

Poker Stars - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 6 Players - (LegoPoker HH Converter)

SB: $259.80
BB: $100.00
UTG: $59.00
MP: $102.40
Hero (CO): $100.00
BTN: $94.50

Preflop: Hero is dealt 9[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/spade.gif[/img] (6 Players)
2 folds, <font color="red">Hero raises to $4.00</font>, BTN folds, SB calls $3.50, BB folds

Flop: ($9) 8[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $6.00</font>, SB calls $6.00

Turn: ($21) 6[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">SB bets $12.00</font>, Hero calls $12.00

River: ($45) 7[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">SB bets $16.00</font>, <font color="red">Hero raises to $57.00</font>