Good fold or am i being too scared?

[EvoLoN]

PokerStars No-Limit Hold'em, $0.25 BB (9 handed) converter

MP3 ($38.60)
Hero ($23.65)
Button ($3.90)
SB ($7.75)
BB ($39.05)
UTG ($11.55)
UTG+1 ($7.10)
MP1 ($23.60)
MP2 ($21.90)

Preflop: Hero is CO with A[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/diamond.gif[/img].
UTG folds, UTG+1 folds, MP1 folds, MP2 folds, MP3 folds, <font color="#CC3333">Hero raises to $1</font>, Button folds, SB calls $0.90, BB calls $0.75.

Flop: ($3) A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">BB bets $0.5</font>, <font color="#CC3333">Hero raises to $2.5</font>, SB folds, BB calls $2.

Turn: ($8) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $2.25</font>, BB calls $2.25.

River: ($12.50) 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $7</font>, Hero folds.

Final Pot: $19.50

[VarlosZ]

Getting almost 3:1 on the end, I think you can call this (though folding isn't ridiculous). There's a good chence that he's trying to scare you away with the one-card straight draw out there, though he could also be value-betting Aces up.

[Kaz The Original]

I think, on this drawless board we should check the turn. If I bet, I bet full pot or 2/3rds.