Do you guys think this was a really stupid call on my part?

***** Hand History for Game 1207183120 *****
$100 NL Hold'em - Sunday, November 21, 21:44:39 EDT 2004
Table Table 14416 (6 max) (Real Money)
Seat 4 is the button
Total number of players : 6
Seat 1: P1 ( $62 )
Seat 5: P2 ( $92.6 )
Seat 10: P4 ( $96.5 )
Seat 3: P3 ( $89.1 )
Seat 8: Me ( $191.15 )
Seat 6: P5 ( $23 )
Me posts small blind [$1].
P2 posts big blind [$2].
** Dealing down cards **
Dealt to me [ Kc 6s ]
P1 calls [$2].
P3 folds.
P2 folds.
P5 calls [$2].
Me calls [$1].
P4 checks.
** Dealing Flop ** [ 9c, Jc, 5c ]
Me bets [$3].
P4 folds.
P1 calls [$3].
P5 folds.
** Dealing Turn ** [ Ad ]
Me bets [$3].
P1 calls [$3].
** Dealing River ** [ 8c ]
Me bets [$10].
P1 is all-In.
Me calls [$44].
Me shows [ Kc, 6s ] a flush, king high.
P1 shows [ Ac, Ks ] a flush, ace high.
P1 wins $126 from the main pot with a flush, ace high with ace kicker.