Several mistakes?

[Benman]

I have no reads yet. Where did I screw up?

PokerStars 0.50/1.00 Hold'em (6 handed)

Preflop: Hero is BB with T/images/graemlins/heart.gif, K/images/graemlins/diamond.gif.
UTG calls, MP calls, CO folds, Button folds, SB completes, Hero checks.

Flop: (4 SB) A/images/graemlins/club.gif, 4/images/graemlins/diamond.gif, K/images/graemlins/heart.gif <font color="blue">(4 players)</font>
SB checks, <font color="CC3333">Hero bets</font>, UTG calls, MP calls, SB folds.

Turn: (3.50 BB) 5/images/graemlins/spade.gif <font color="blue">(3 players)</font>
<font color="CC3333">Hero bets</font>, <font color="CC3333">UTG raises</font>, MP folds, Hero calls.

River: (7.50 BB) 8/images/graemlins/heart.gif <font color="blue">(2 players)</font>
Hero checks, <font color="CC3333">UTG bets</font>, Hero folds.

Final Pot: 8.50 BB

[Joe826]

fold the turn. i realize you're technically getting odds to draw to your 5 outs but if you're opponent has aces up you're drawing to 2 outs, and if they have a better hand than that, you're drawing dead.

[RunDownHouse]

In addition to the above, this pot isn't all that big, this isn't a draw-heavy board, so I don't think you're seeing a bluff or semi-bluff very often here. I fold this to the turn raise, and if I call that, to the river bet.

[mooks]

as everyone else has said, easy fold on the turn