As played I'm probably making a crying call on the river and folding to any reraise behind me, but I think a fold is fine. Raising gets us nowhere as a) we don't push out any better hands and b) we don't get value from any worse hands. I think the biggest issue in this hand is how you played up to this point, though. We're clueless as to our opponents' ranges here, aren't sure how our hand stacks up against them, and have made our whole decision pretty tough.
Something I try to do frequently in spots like these is to bet the flop, or if it gets checked around, then bet the turn. The reason for this is to get our information for a cheaper price so that we don't find ourselves in these types of spots later on in the hand.
Say the action goes...
Dealt to MrSticker66 [6h Ad]
theo1986222: calls $0.25
Justmemarius: calls $0.25
Ian013: calls $0.25
Wolack: calls $0.25
bird9999: calls $0.15
*** FLOP *** [7d Js As]
dickweeds69 joins the table at seat #6
MrSticker66: bets $1
theo1986222: raises to $3
...like that. Now we've spent $1 to find out where we're at (as well as protect vs draws, and get value from worse pairs), and can safely fold assuming theo limped with a bigger ace, or is making a very strong bluff that we can't call.
So basically by betting earlier on in a hand we make our later decisions a lot easier. This is similar to playing tight preflop hand requirements makes your postflop decisions a lot easier as well vs playing a loose aggressive style preflop, and facing all types of tough decisions postflop.