Bad push or bad luck?

[SuitedPair]

$10+1.

Party Poker No-Limit Hold'em Tourney, Big Blind is t100 (6 handed) converter

Hero (t655)
UTG (t1565)
MP (t875)
CO (t1355)
Button (t2185)
SB (t1365)

Preflop: Hero is BB with Q[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, MP calls t100, <font color="#666666">1 fold</font>, Button calls t100, <font color="#666666">1 fold</font>, Hero checks.

Flop: (t350) 9[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, MP checks, Button checks. (I almost pushed here thinking the flop likely missed everyone and as the BB it could have hit me, either with a pair or giving me a straight draw.)

Turn: (t350) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets t555 (All-In)</font>, MP folds, Button calls t555.

River: (t1460) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

Final Pot: t1460

Results in white below: <font color="#FFFFFF">
Hero has Qs 6h (one pair, queens).
Button has Qh 8d (one pair, queens).
Outcome: Button wins t1460. </font>

Lately I've been having trouble deciding between aggression and patience when its 5-6 handed and I'm the short stack.