More bad play

I don't know why I do this. But, very often, in this position I get the uncontrollable urge to put all my chips in.

Table "STT 3630229 - 1" Seat 8 is the button.
Seat 3: lotusgirl (1792 in chips)
Seat 4: TumTiddle (1268 in chips)
Seat 6: Gav007 (2726 in chips)
Seat 7: Norman22 (1591 in chips)
Seat 8: Scirish (1723 in chips)
Seat 9: Cirref (900 in chips)
Cirref: posts small blind 50
lotusgirl: posts big blind 100
----- HOLE CARDS -----
dealt to TumTiddle [8c 8h]
TumTiddle: calls 100
Gav007: calls 100
Norman22: folds
Scirish: folds
Cirref: folds
lotusgirl: checks
----- FLOP ----- [3h 6h 5h]
lotusgirl: checks
TumTiddle: bets 350
Gav007: raises to 700
lotusgirl: folds
TumTiddle: raises to 1168 and is all-in
Gav007: calls 468
----- TURN ----- [3h 6h 5h][7c]
----- RIVER ----- [3h 6h 5h 7c][Tc]
----- SHOW DOWN -----
TumTiddle: shows [8c 8h] (A Pair of Eights, Ten high)
Gav007: shows [Kh 9h] (A Flush, King high)
Gav007 collects 2686 from Main pot
----- SUMMARY -----
Total pot 2686 Main pot 2686 Rake 0
Board [3h 6h 5h 7c Tc]
Seat 3: lotusgirl (big blind) folded on the Flop
Seat 4: TumTiddle showed [8c 8h] and lost
Seat 6: Gav007 showed [Kh 9h] and won (2686) with A Flush, King high
Seat 7: Norman22 folded before Flop (didn't bet)
Seat 8: Scirish (button) folded before Flop (didn't bet)
Seat 9: Cirref (small blind) folded before Flop (didn't bet)