Assume standard 50NL opponent

PokerStars No-Limit Hold'em, $0.50 BB (4 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

SB ($149.80)
BB ($71.65)
UTG ($49.75)
Hero ($48.85)

Preflop: Hero is Button with 7, 6.
1 fold, Hero raises to $2, 1 fold, BB calls $1.50.

Flop: ($4.25) 6, 7, A (2 players)
BB checks, Hero bets $3, BB raises to $7, Hero calls $4.

Turn: ($18.25) A (2 players)
BB checks, Hero checks.

River: ($18.25) J (2 players)
BB bets $8, Hero ...

So I only have to be good like 25% of the time, but I'm not winning 25% My mind tells me to call, my says fold you're beat. Does the info make it worthwhile?

I'm still trying to decide what questions I should be asking myself to improve my play. So as always any comments are appreciated.