25 NL. Facing all in re-raise on river, holding low pair

[zasterguava]

This is my first post here and a hand from my first 2k cash hands I've played in the past few days (SNG transition). My playing stats are 31/14 and I have no read on opponent other than from the hand itself. Are you calling the river here and would you have put yourself in this position?

Poker Stars, $0.10/$0.25 NL Hold'em Cash Game, 6 Players
LeggoPoker.com - Hand History Converter

UTG: $19.50
MP: $15
CO: $25
BTN: $46.90
Hero (SB): $24.65
BB: $25.55

MP posts $0.25
Pre-Flop: 6[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/spade.gif[/img] dealt to Hero (SB)
UTG folds, MP checks, CO folds, BTN calls $0.25, <font color="red">Hero raises to $1</font>, 2 folds, BTN calls $0.75

Flop: ($2.50) 5[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $1.65</font>, BTN calls $1.65

Turn: ($5.80) T[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $2.25</font>, BTN calls $2.25

River: ($10.30) 8[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $5</font>, <font color="red">BTN raises to $42 and is All-In</font>, Hero ($14.75 to call) ???