NL100 Zoom 6Max, BB vs SB, loose call, end up overbet bluffing on river

The villain is 29/33/af1.1 STL30 FCBT0 109 hands

I think the call is too loose. 2BB yes but 3BB is no, imo.

So, now only thing I can do it bluff to rectify my mistake preflop.

Also, overbetting as value seems stupid because whenever I overbet bluff people fold.

May be we can discuss when overbet for value is appropriate some other time.

PokerStars - $1 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

BTN: 51.4 BB
SB: 100 BB
Hero (BB): 633.51 BB
UTG: 91.66 BB
MP: 52.41 BB
CO: 101 BB

SB posts SB 0.5 BB, Hero posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has 3♣ J♣

fold, fold, fold, fold, SB raises to 3 BB, Hero calls 2 BB

Flop: (6 BB, 2 players) Q♥ 6♠ 8♥
SB checks, Hero checks

Turn: (6 BB, 2 players) 2♦
SB checks, Hero checks

River: (6 BB, 2 players) 7♥
SB checks, Hero bets 8.09 BB

Thoughts?