[6-max] So sad to fold a set :'(

PokerStars - $0.02 NL (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

MP: 75.5 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 19)
CO: 100 BB (VPIP: 15.79, PFR: 10.53, 3Bet Preflop: 0.00, Hands: 20)
BTN: 280.5 BB (VPIP: 16.00, PFR: 12.00, 3Bet Preflop: 0.00, Hands: 25)
SB: 56 BB (VPIP: 100.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 4)
BB: 146.5 BB (VPIP: 25.64, PFR: 25.64, 3Bet Preflop: 14.29, Hands: 39)
Hero (UTG): 104.5 BB

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has 6♥ 6♠

Hero raises to 3 BB, fold, fold, fold, SB calls 2.5 BB, fold

Flop: (7 BB, 2 players) K♣ Q♠ T♥
SB checks, Hero bets 3.5 BB, SB calls 3.5 BB

Turn: (14 BB, 2 players) 6♣
SB checks, Hero bets 10 BB, SB calls 10 BB

River: (34 BB, 2 players) J♦
SB bets 39.5 BB and is all-in, fold

SB wins 33 BB

My thoughts: Im curious about his stack size, is this a call, even though im pretty sure he has the straight?

Thanks!