Please teach me how to win at poker

[PokerBob]

I didn't play much online once the party split happened. Now I'm back playing online and I noticed that in my last 17K hands I have lost 450BB at mulitple limits. I clearly suck. I played this hand today. Villain is unknown. Thoughts?

Party Poker 5/10 Hold'em (6 max, 6 handed) FTR converter on zerodivide.cx

Preflop: Hero is CO with Q[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img].
UTG calls,1 fold</font>,Hero raises</font>, Button calls, 2 folds</font>, UTG calls.

Flop: (7.40 SB) J[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/diamond.gif[/img](3 players)
UTG checks, Hero bets</font>, Button folds, UTG calls.

Turn: (4.70 BB) 9[img]/images/graemlins/club.gif[/img] 2 players)</font>
UTG checks, Hero bets</font>, UTG calls.

River: (6.70 BB) 3[img]/images/graemlins/club.gif[/img] 2 players)</font>
UTG bets</font>, Hero calls.

Final Pot: 8.70 BB