JJ played terribly. How to do better in this case?

[joker 77]

Poker Stars
Limit Holdem Ring game
Limit: $0.25/$0.5
8 players
Converter

Pre-flop: (8 players) Hero is SB with J[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/spade.gif[/img]
UTG calls, 2 folds, MP2 calls, <font color="#cc0000">CO raises</font>, Button folds, Hero calls, BB folds, UTG calls, MP2 calls.

Flop: 6[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/club.gif[/img] (9SB, 4 players)
<font color="#cc0000">Hero bets</font>, <font color="#cc0000">UTG raises</font>, MP2 folds, CO calls, <font color="#cc0000">Hero 3-bets</font>, <font color="#cc0000">UTG caps</font>, CO calls, Hero calls.

Turn: 9[img]/images/graemlins/diamond.gif[/img] (10.5BB, 3 players)
<font color="#cc0000">Hero bets</font>, <font color="#cc0000">UTG raises</font>, CO folds, Hero calls.

River: A[img]/images/graemlins/heart.gif[/img] (14.5BB, 2 players)
Hero checks, <font color="#cc0000">UTG bets</font>, Hero calls.

Results:
Final pot: 16.5BB

I think I screwed up this hand. How to play it better?