nl50 AA played poorly I think

[PokerFun007]

PokerStars No-Limit Hold'em, $0.50 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($7.30)
SB ($20.20)
BB ($45.10)
UTG ($25.15)
UTG+1 ($35.40)
MP1 ($49.25)
MP2 ($55.10)
Hero ($50)

Preflop: Hero is CO with A[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img]. Hero posts a blind of $0.50.
<font color="#666666">1 fold</font>, UTG+1 calls $0.50, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero (poster) raises to $2.5</font>, <font color="#666666">1 fold</font>, SB calls $2.25, <font color="#666666">1 fold</font>, UTG+1 calls $2.

Flop: ($8) 3[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">UTG+1 bets $3.5</font>, Hero calls $3.50, <font color="#CC3333">SB raises to $17.7</font>, UTG+1 calls $14.20, Hero calls $14.20.

Turn: ($61.10) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG+1 bets $15.2 (All-In)</font>, Hero calls $15.20.

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

Final Pot: $91.50

I think I need to raise the flop, but his bet after calling twice pre-flop wigged me out a bit. I thought set right away for some reason. I made a crying call here on the initial bet. You would have raised, right?

Then the UTG+1 gets all rowdy and raises all in. I called because I love American Airlines. I figured he could have an overpair, two pair (and I have draws), but he could also have a set. What do you do here?

By this time on the turn, it's going in, so I called the all in bet from my opponent.

I think I was way too timid with this hand. What do you think?