What the heck is wrong with me (PP $5/$10 - KK)?

[angst]

Sometimes I make plays that leave me completely dumbfounded over my line. What the heck am I thinking on the river? Being afraid of AA and 77 is seeing monsters under the bed, right?

UTG is 50/7.6/0.75 over 25 hands.

Party Poker 5/10 Hold'em (6 max, 6 handed) converter

Preflop: Hero is SB with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img].
UTG calls, MP calls, <font color="#666666">1 fold</font>, Button calls, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">UTG 3-bets</font>, MP folds, Button folds, <font color="#CC3333">Hero caps</font>, UTG calls.

Flop: (11 SB) 7[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, UTG calls.

Turn: (6.50 BB) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">UTG raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">UTG caps</font>, Hero calls.

River: (14.50 BB) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">UTG raises</font>, Hero calls.

Final Pot: 18.50 BB