KK on pretty average board in 3bet pot. am i too weak in these spots?

[fitnessfreak]

villain is 26/15/2 over 90 hands.

i really suck at playing big pairs in these (what i perceive to be) dodgy situations. should i just be trying to get the money in here on the flop? his turn bet was fairly big so i just went into calldown mode. tbh im unsure about how to proceed on any of the streets. so i guess comments on all streets appreciated.

apologies if this is standard, but this appears to be a major leak in my game that i want to fix.

Party Poker - No Limit Hold'em Cash Game - $3/$6 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $684.30
Hero (BB): $743.75
UTG: $120.00
MP: $269.75
CO: $971.70
BTN: $587.25

Preflop: Hero is dealt K[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/spade.gif[/img] (6 Players)
4 folds, <font color="red">SB raises to $21.00</font>, <font color="red">Hero raises to $72.00</font>, SB calls $51.00

Flop: ($144) Q[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/diamond.gif[/img] (2 Players)
SB checks, Hero checks

Turn: ($144) 7[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">SB bets $150.00</font>, Hero calls $150.00

River: ($444) Q[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">SB bets $102.00</font>, Hero calls $102.00