Mid Stakes Shorthanded NL Poker Forums

Villain here is 24/12/4 over less than 20 hands, no other reads/info.

Poker Stars $400.00 No Limit Hold'em - 6 players - View hand 138450
The Official DeucesCracked.com Hand History Converter

BTN: $400.00
SB: $193.65
BB: $339.20
UTG: $192.50
MP: $702.00
Hero (CO): $478.00

Pre Flop: ($6.00) Hero is CO with 7 7
UTG raises to $8, 1 fold, Hero calls $8, BTN calls $8, 1 fold, BB calls $4

Flop: ($34.00) K 7 A (4 players)
BB checks, UTG bets $8.00, Hero raises to $30, BTN calls $30, BB folds, UTG folds

Turn: ($102.00) 8 (2 players)
Hero bets $66.00, BTN raises to $144, Hero calls $78

River: ($390.00) T (2 players)
Hero checks, BTN bets $218.00, Hero folds

Final Pot: $390.00
BTN wins $169.00
BTN wins $218.00
(Rake: $3.00)

Having just moved up to ssnl+, I'm not sure whether or not I played this too scared. I mean, it's obvious that given villain's flop and turn lines, he is representing only a flush, but did I really play this optimally?

Thanks.