Put myself in a tough decision. . .what to do?

[ReDeYES88]

Party Poker No-Limit Hold'em Tourney, Big Blind is t300 (5 handed) converter

UTG (t3960)
MP (t1185)
Button (t240)
Hero (t1300)
BB (t1315)

Preflop: Hero is SB with K[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/spade.gif[/img].
UTG calls t300, <font color="#666666">2 folds</font>, Hero completes, BB checks.

Didn't want to raise with the big stack limp, but just couldn't seem to lay this one down. I complete. Very lucky that BB didn't overpush.

Flop: (t900) K[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, BB checks, UTG checks.

Yikes.

Turn: (t900) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets t300</font>, BB calls t300, UTG folds.

Where am I?

River: (t1500) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">BB bets t715 (All-In)</font>,

Hero?

Final Pot: t2915