Hey guys so this is the second hand that I played and I need your opinion on...

So I played this hand on a low stakes 20k pokerstars MTT. BLinds are at 150/300, I am on the button with KJ off. Cutoff min raises to 600..I contemplate whether or not I should 3bet the cutoff but then the SB and BB are both sharks/regs (both are ranked on pocket fives) so I thought maybe I should just call n see a flop (i wouldnt know what to do if I got 4bet by one of the sharks..looking back on it now I regret my decision)..flop comes king high with 3h2h and the bb (shark) donk bets less than half the pot..original raiser folds, sb folds n me n the bb r HU (at this point I feel like I might have the best hand, I felt like he might be donk betting somekind of combo draw like 45hh)...turn is the 4h, villain instantly barrels this time almost 2/3pot, I call...river is the Qh n again he fires a third barrel and I am forced to fold...so my question is should I have 3bet pre? n what will you guys call the bet on the turn??

PokerStars Hand #111565500258: Tournament #858625678, $3.00+$0.30 USD Hold'em No Limit - Level X (150/300) - 2014/02/09 16:46:51 ET
Table '858625678 228' 9-max Seat #7 is the button
Seat 1: mogz73 (4668 in chips) 
Seat 2: Heretic66688 (4698 in chips) 
Seat 3: 10DiamondsBY (8315 in chips) 
Seat 4: krixon (10315 in chips) 
Seat 5: VicBiggs (18192 in chips) 
Seat 6: MIL_O_90 (27589 in chips) 
Seat 7: HERO (12952 in chips) 
Seat 8: keyhell (21398 in chips) 
Seat 9: Lionet (11940 in chips) 
*** HOLE CARDS ***
Dealt to HERO [Jd Ks]
mogz73: folds 
Heretic66688: folds 
10DiamondsBY: folds 
krixon: folds 
VicBiggs: folds 
MIL_O_90: raises 300 to 600
HERO: calls 600
keyhell: calls 450
Lionet: calls 300
*** FLOP *** [3h Kh 2s]
keyhell: checks 
Lionet: bets 997
MIL_O_90: folds 
HERO: calls 997
keyhell: folds 
*** TURN *** [3h Kh 2s] [4h]
Lionet: bets 1695
HERO: calls 1695
*** RIVER *** [3h Kh 2s 4h] [Qh]
Lionet: bets 2881
HERO: folds 
Uncalled bet (2881) returned to Lionet
Lionet collected 8234 from pot
*** SUMMARY ***
Total pot 8234 | Rake 0 
Board [3h Kh 2s 4h Qh]