0.25-0.50 PStars: Playing AK very aggro OOP

[RoccoGe]

Poker Stars, $0.25/$0.50 NL Hold'em Cash Game, 4 Players
LeggoPoker Hand History Converter

UTG: $54
BTN: $52.60
SB: $63.95
Hero (BB): $67.55

Pre-Flop: A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img] dealt to Hero (BB)
<font color="red">UTG raises to $1.50</font>, <font color="red">BTN raises to $4.50</font>, SB folds, <font color="red">Hero raises to $12</font>, UTG folds, BTN calls $7.50

Flop: ($25.75) J[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $21</font>

Is this too aggro?I mean,i played it this way because i really don't like playing AK oop cold calling a re-raise,i usually end up folding to the opponent aggression even if i flop something.

Rocco