5/10NL bottom set/scary river/facing aggression

[tdarko]

MP(1540) raises to 30, CO(790) calls, i call on the Button with 6's(1590).

flop (6 [img]/images/graemlins/diamond.gif[/img]8 [img]/images/graemlins/club.gif[/img]10 [img]/images/graemlins/diamond.gif[/img])pot~105
MP bets $50, CO folds, Hero raises $285, MP calls.

turn (6 [img]/images/graemlins/diamond.gif[/img]8 [img]/images/graemlins/club.gif[/img]10 [img]/images/graemlins/diamond.gif[/img]A [img]/images/graemlins/spade.gif[/img])pot~440
MP checks, Hero bets $500, MP calls.

river (6 [img]/images/graemlins/diamond.gif[/img]8 [img]/images/graemlins/club.gif[/img]10 [img]/images/graemlins/diamond.gif[/img]A [img]/images/graemlins/spade.gif[/img]9 [img]/images/graemlins/diamond.gif[/img])pot~1440
MP goes all-in for $675...???

that's a pretty rough card for me but is this pot too big to fold.

should i have just pushed the turn and saved myself this trouble here on the river?

i think i got myself in a little bit of a bind here by just overbetting the pot and not pushing the pot or was i behind all along?

EDIT: i usually play 2/4--3/6 but will occasionally take some time at this game.