I feel that I played this hand too passively. That is my standard line when flopping second pair to c/call, due to the 'only fold out worse, called by better' but I think that's wrong in this instance?
Should I be betting then barreling on 7,4,6,5,A, and clubs? What other over cards should I barrel on K? Q?

PokerStars - $0.05 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

BTN: 100 BB (VPIP: 22.22, PFR: 16.67, 3Bet Preflop: 0.00, Hands: 18)
SB: 103.2 BB (VPIP: 29.41, PFR: 23.53, 3Bet Preflop: 25.00, Hands: 17)
Hero (BB): 113.8 BB
UTG: 113.4 BB (VPIP: 21.43, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 14)
MP: 116.2 BB (VPIP: 14.58, PFR: 12.50, 3Bet Preflop: 11.11, Hands: 50)
CO: 113.2 BB (VPIP: 18.75, PFR: 6.25, 3Bet Preflop: 0.00, Hands: 16)

SB posts SB 0.4 BB, Hero posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has 5 6

fold, fold, fold, BTN raises to 2 BB, fold, Hero raises to 8 BB, BTN calls 6 BB

Flop: (16.4 BB, 2 players) 8 5 3
Hero checks, BTN bets 10.4 BB, Hero calls 10.4 BB

Turn: (37.2 BB, 2 players) A
Hero checks, BTN checks

River: (37.2 BB, 2 players) 2
Hero checks, BTN bets 20 BB, fold

BTN wins 35.6 BB

Yeah i'd definitely C-bet as our hand is very vulnerable to being outdrawn by random overs of which a decent chunk should fold to our C-bet. Picking up the pot right here would be an excellent result and if we get called we have a bunch of turns on which we can double barrel.

Hand seems standard.

Well played.