Confusing hand

[wall_st]

Villan is new to the table has been fairly agrressive so far. On the flop I felt as though it was very likely I would get check raised, but my hand was so vunerable I wanted to bet to protect it. Folding here seemed correct.

Party Poker No-Limit Hold'em, $ Hero (6 max, 4 handed) converter

UTG ($96)
Button ($141.49)
SB ($104.15)
Hero ($151.15)

Preflop: Hero is BB with 9[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/diamond.gif[/img]. SB posts a blind of $0.50.
<font color="#666666">2 folds</font>, SB (poster) completes, <font color="#CC3333">Hero raises to $2</font>, <font color="#CC3333">SB raises to $4.5</font>, Hero calls $2.

Flop: ($10) 8[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $9</font>, <font color="#CC3333">SB raises to $18</font>, Hero folds.

Final Pot: $37