50NL from Friday night. Call/shove river?

[RapidEvolution]

I'm new to the table and readless. :/

$0.25/$0.5 No Limit Holdem
7 players
Converted at weaktight.com

Stacks:
UTG (<font color="#0000cc">$59.90</font>)
UTG+1 (<font color="#0000cc">$48.00</font>)
MP (<font color="#0000cc">$12.05</font>)
CO (<font color="#0000cc">$43.70</font>)
Hero (<font color="#0000cc">$50.45</font>)
SB (<font color="#0000cc">$42.45</font>)
BB (<font color="#0000cc">$37.50</font>)

Pre-flop: ($0.75, 7 players) Hero is BTN K[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/club.gif[/img]
UTG calls $0.5, <font color="#777777">3 folds</font>, <font color="#cc0000">Hero raises to $2.25</font>, <font color="#777777">2 folds</font>, UTG calls $1.75

Flop: T[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/heart.gif[/img] ($5.25, 2 players)
<font color="#cc0000">UTG bets $3</font>, Hero calls $3

Turn: T[img]/images/graemlins/diamond.gif[/img] ($11.25, 2 players)
<font color="#cc0000">UTG bets $5</font>, <font color="#cc0000">Hero raises to $15</font>, UTG calls $10

River: 3[img]/images/graemlins/heart.gif[/img] ($41.25, 2 players)
<font color="#cc0000">UTG bets $15</font>, <font color="#cc0000">Hero?</font>