Poker Stars, $0.10/$0.25 No Limit Hold'em Cash, 6 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

SB: $11.35 (45.4 bb)
Hero (BB): $26.62 (106.5 bb)
UTG: $41.61 (166.4 bb)
MP: $66.25 (265 bb)
CO: $52.16 (208.6 bb)
BTN: $19.16 (76.6 bb)

Preflop: Hero is BB with Th Ts
UTG raises to $0.75, MP folds, CO calls $0.75, 2 folds, Hero calls $0.50

Flop: ($2.35) 3h 8c 7d (3 players)
Hero checks, UTG bets $1.25, CO folds, Hero calls $1.25

Turn: ($4.85) 6s (2 players)
Hero checks, UTG bets $4.75, Hero calls $4.75

River: ($14.35) 2d (2 players)
Hero checks, UTG bets $34.86 and is all-in, Hero folds

I found myself in this difficult spot on the river.

Flop is an easy call, turn is almost a pot bet but with the inside straight and overpair I don't mind another call

If he would have bet /60/70% pot on river I would have folded but now I just thought is he bluffing because my line doesn't show much strength, after a long thought I folded because of the overpairs (which beat mine) are also in his range....

Any thoughts,,,,