Why bluff ?

Don't know why they bluff me, i'm a fish and i call everything don't i ?

Started to play evening sessions and game ismuch wilder then in the morning, will have to adapt calling ranges.

PokerStars Game #53467682651: Tournament #336584723, $12+$1 USD Hold'em No Limit - Level III (25/50) - 2010/11/29 20:10:22 CET [2010/11/29 14:10:22 ET]
Table '336584723 1' 6-max Seat #2 is the button
Seat 2: tinajet (6315 in chips)
Seat 3: GunTucker45 (1345 in chips)
Seat 4: entabeni (1340 in chips)
GunTucker45: posts small blind 25
entabeni: posts big blind 50
*** HOLE CARDS ***
Dealt to entabeni [4h 2s]
tinajet: folds
GunTucker45: calls 25
entabeni: checks
*** FLOP *** [3h 4d Ah]
GunTucker45: bets 100
entabeni: calls 100
*** TURN *** [3h 4d Ah] [Ad]
GunTucker45: bets 200
entabeni: calls 200
*** RIVER *** [3h 4d Ah Ad] [Qh]
GunTucker45: bets 995 and is all-in
entabeni: calls 990 and is all-in
Uncalled bet (5) returned to GunTucker45
*** SHOW DOWN ***
GunTucker45: shows [Ts 6h] (a pair of Aces)
entabeni: shows [4h 2s] (two pair, Aces and Fours)
entabeni collected 2680 from pot
*** SUMMARY ***
Total pot 2680 | Rake 0
Board [3h 4d Ah Ad Qh]
Seat 2: tinajet (button) folded before Flop (didn't bet)
Seat 3: GunTucker45 (small blind) showed [Ts 6h] and lost with a pair of Aces
Seat 4: entabeni (big blind) showed [4h 2s] and won (2680) with two pair, Aces and Fours