AA, is this a fold on the turn?

[TheGrinder]

How did I play this, am I automatically going too far with my big pocket pairs? I lost just 70bb during one session and it might have affected my play a little. No reads on the CO, he has only 15 hands.

Poker Stars
Limit Holdem Ring game
Limit: $3/$6
6 players
Converter

Pre-flop: (6 players) Hero is UTG with A[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/heart.gif[/img]
<font color="#cc0000">Hero raises</font>, UTG+1 folds, CO calls, Button folds, SB calls, BB calls.

Flop: 5[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/club.gif[/img] (8SB, 4 players)
SB checks, BB checks, <font color="#cc0000">Hero bets</font>, CO calls, SB calls, BB folds.

Turn: 3[img]/images/graemlins/diamond.gif[/img] (5.5BB, 3 players)
SB checks, <font color="#cc0000">Hero bets</font>, <font color="#cc0000">CO raises</font>, SB folds, Hero calls.

River: 3[img]/images/graemlins/heart.gif[/img] (9.5BB, 2 players)
Hero checks, <font color="#cc0000">CO bets</font>, Hero calls.

Results:
Final pot: 11.5BB