Ugh... concede or call on the river?

[TakeMeToTheRiver]

Please rip me a new a-hole... I played like crap... I will try to justify my moves below...

PokerStars No-Limit Hold'em, $0.50 BB (8 handed)

BB ($54.55)
UTG ($13.35)
UTG+1 ($23.75)
MP1 ($67.30)
MP2 ($19.50)
CO ($38.95)
Button ($58.65)
Hero ($47.90)

Preflop: Hero is SB with J[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img].
UTG folds, UTG+1 calls $0.50, <font color="CC3333">MP1 raises to $1</font>, MP2 folds, CO calls $1, Button folds, Hero calls $0.75, BB calls $0.50, UTG+1 calls $0.50.

Terrible position, but I couldn't throw this away for $0.75.

Flop: ($5) 8[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/club.gif[/img] <font color="blue">(5 players)</font>
<font color="CC3333">Hero bets $2</font>, BB calls $2, UTG+1 calls $2, MP1 folds, CO folds.

A wimpy small bet, but at this table I felt that it would stop anyone else from taking control...

Turn: ($11) K[img]/images/graemlins/heart.gif[/img] <font color="blue">(3 players)</font>
<font color="CC3333">Hero bets $2</font>, <font color="CC3333">BB raises to $6</font>, UTG+1 calls $6, Hero calls $4.

Tried the same thing I did on the flop... trying to represent TPWK... then I had pot odds to go for the flush

River: ($29) 2[img]/images/graemlins/club.gif[/img] <font color="blue">(3 players)</font>
<font color="CC3333">Hero bets $4</font>, <font color="CC3333">BB raises to $40</font>, UTG+1 calls $14.75 (All-In)...

First: BANG! Made the flush... then OUCH! What do I do?