Aggression when on the blinds

[mr_perry84]

Did i play this badly?

Party Poker 1/2 Hold'em (10 handed) converter

Preflop: Hero is SB with J[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">8 folds</font>, Hero completes, BB checks.

Flop: (2 SB) 9[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, BB checks.

Turn: (1 BB) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls.

River: (3 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">BB raises</font>, Hero calls.

Final Pot: 7 BB

Results in white below: <font color="#FFFFFF">
Hero has Jh 8d (one pair, eights).
BB has 4d 8c (two pair, eights and fours).
Outcome: BB wins 7 BB. </font>