NL10 FR 66 set

Poker Stars $25.00 No Limit Hold'em - 7 players - View hand 1690854
DeucesCracked Poker Videos Hand History Converter

CO: $66.41 - VPIP: 9, PFR: 0, 3B: 0, AF: 0.0, Hands: 11
BTN: $34.00 - VPIP: 33, PFR: 4, 3B: 13, AF: 5.0, Hands: 24
SB: $15.61 - VPIP: 11, PFR: 0, 3B: 0, AF: 0.0, Hands: 9
Hero (BB): $25.00 - VPIP: 18, PFR: 15, 3B: 3, AF: 3.7, Hands: 15141
UTG: $14.94 - VPIP: 33, PFR: 15, 3B: 0, AF: 2.8, Hands: 54
UTG+1: $28.73 - VPIP: 20, PFR: 12, 3B: 0, AF: 5.0, Hands: 51
MP: $25.12 - VPIP: 17, PFR: 17, 3B: 0, AF: 2.0, Hands: 23

Pre Flop: ($0.35) Hero is BB with 6 6
2 folds, MP raises to $0.87, 3 folds, Hero calls $0.62

Flop: ($1.84) 6 5 8 (2 players)
Hero checks, MP bets $1.32, Hero raises to $5, MP calls $3.68

Turn: ($11.84) 4 (2 players)
Hero bets $6.25, MP raises to $19.25, Hero folds

1. Should I just check/call or bet/call ? I really confused... Played turn as bad as I can ♦

Now I think I had to stackoff here easilly...

Board: 8♦5♦6♣ 4♥
       Equity     Win     Tie
MP1    30.45%  26.36%   4.09% { QQ+, 88-77, 55 }
BB     69.55%  65.45%   4.09% { 6d6s }