Bluffing

The amount of times I make this move and get called is unbelievable. Naturally, I win most of the time. And it's really annoying when they hit. I can never understand why people think I was bluffing.

NL Texas Hold'em $10 Buy-in + $1 Entry Fee, Level:1 Blinds(10/20-(no ante)) - Tuesday, March 06, 23:30:59 GMT 2007
$10+$1 (9 seats) NLH #597994
Table 1 9-max (Real Money)
Seat 9 is the button
Total number of active players : 9
Seat 1: bk1234 ( 1,020 )
Seat 2: Robbobet ( 1,480 )
Seat 3: Mosmo ( 1,336 )
Seat 4: Tralis ( 2,240 )
Seat 5: bigdazzy ( 1,116 )
Seat 6: berti07 ( 1,470 )
Seat 7: ggg2ggg ( 1,280 )
Seat 8: RumTiddle ( 1,850 )
Seat 9: Thrappers ( 1,708 )
Tourney Level:1 Blinds(10/20-(no ante))
bk1234 posts small blind [10]
Robbobet posts big blind [20]
** Dealing down cards **
Dealt to RumTiddle [ Qc, Qd ]
Mosmo folds
Tralis folds
bigdazzy calls [20]
berti07 folds
ggg2ggg raises to [90]
RumTiddle calls [90]
Thrappers folds
bk1234 folds
Robbobet calls [70]
bigdazzy calls [70]
** Dealing Flop ** [ Jd, 2h, 9s ]
Robbobet checks
bigdazzy checks
ggg2ggg bets [370]
RumTiddle goes all-in
RumTiddle raises to [1,760]
Robbobet folds
bigdazzy folds
ggg2ggg calls [820]
ggg2ggg goes all-in
Returning uncalled bet [570] to RumTiddle
** Showdown **
ggg2ggg shows [ 9c, Ad ]
RumTiddle shows [ Qc, Qd ]
** Dealing Turn ** [ 6c ]
** Dealing River ** [ 9h ]
** Hand Conclusion **
ggg2ggg wins 2,750 from main pot with three of a kind, Nines