Prima, $0.25/$0.50 No Limit Hold'em Cash, 5 Players
MP: $40.75 (81.5 bb)
CO: $62.17 (124.3 bb)
Hero (BTN): $50 (100 bb)
SB: $52.50 (105 bb)
BB: $146.74 (293.5 bb)
Preflop: Hero is BTN with J

J

2 folds,
Hero raises to $1.50,
SB folds,
BB raises to $4.50, Hero calls $3
Flop: ($9.25) 6

4

2
(2 players)
BB bets $5.50, Hero calls $5.50
Turn: ($20.25) 6
(2 players)
BB bets $13.75,
Hero folds
Anon table.
BB seemed like an aggro reg (26/20).
The good old classic again...

I didnt have the heart to fold JJ, but against unknown it's pretty hard to play postflop. Is preflop 4bet a good option? 4bet/call or 4bet/broke?
On the turn I can play the guessing game... Should I call here, and ch/fold river, as it's unlikely that he would 3barrel air with a bluffpush?