I'm trying to make better river folds as lately I seem to be calling down everything and losing virtually everyone. This is my first hand at the table, so no reads at all.

Party Poker 0.50/1 Hold'em (10 handed) FTR converter on zerodivide.cx

Preflop: Hero is CO with A[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/heart.gif[/img]. Hero posts a blind of $0.50.
<font color="#666666">1 fold</font>, UTG+1 calls, <font color="#666666">3 folds</font>, MP3 calls, Hero (poster) checks, <font color="#666666">1 fold</font>, SB completes, BB checks.

Flop: (5 SB) 4[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, UTG+1 checks, MP3 checks, <font color="#CC3333">Hero bets</font>, SB calls, BB folds, UTG+1 folds, MP3 calls.

Turn: (4 BB) 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, MP3 checks, <font color="#CC3333">Hero bets</font>, SB folds, MP3 calls.

River: (6 BB) Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP3 bets</font>, ...

All I can beat is a bluff or a weaker 6. Should I call anyway?