Villian is 18/6 over 16 hands. obv i can't call this river. did i donk it up before that point? 3bet ai on the turn?

Party Poker No-Limit Hold'em, $ BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($148.01)
UTG ($198.05)
MP ($142.99)
CO ($113.40)
Button ($26.10)
Hero ($173.50)

Preflop: Hero is SB with T, T. Hero posts a blind of $0.50.
UTG raises to $4, 3 folds, Hero (poster) calls $3.50, 1 fold.

Flop: ($9) Q, K, T (2 players)
Hero bets $7, UTG calls $7.

Turn: ($23) 3 (2 players)
Hero bets $20, UTG raises to $50, Hero calls $30.

River: ($123) J (2 players)
Hero checks, UTG bets $50, Hero folds.

Final Pot: $173