NL50 - Q9o Iso Raise, Monotone Board, Turned 2Pair - Linecheck

[Parvex]

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG ($36.60)
MP ($51.95)
CO ($165.35)
Hero ($49.75)
SB ($41.25)
BB ($54.30)

Preflop: Hero is Button with Q[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, MP calls $0.50, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $2.5</font>, SB calls $2.25, <font color="#666666">1 fold</font>, MP folds.

Flop: ($6) K[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $5.5</font>, Hero calls $5.50.

Turn: ($17) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $33.25 (All-In)</font>, Hero calls $33.25.

River: ($0) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

Final Pot: $83.50

Villains Stats are 20/7/1.7 over ~220 hands.

I played this hand and felt lost on the flop and on the turn, but somehow came to the conclusion I have to call both streets. Am I right?

Besides that: Is the pf iso raise, without having a read on villain limp/folding too much preflop, to loose?