10 handed 30/60 party

I'm on the bb w/ AcJs

3rd position is a 12/9/1.8 raises, 4th position calls (no stats), 5th position cold calls (27/11/2.9), I call

flop is Ad Tc 9c, I check, 3rd and 4th position check, 5th position bets, I c/r with top pair and the backdoor nut flush draw and backdoor straight draw, 2 folds, 5th position 3 bets, I call

turn is Jd, I c/r and am 3 bet again.....

I have odds to call here, but can I really fold the river unimproved in a pot this big?..... what about if a 3rd club hits, can I fold then?