[JFB37]

What an odd hand. As your post suggests, you played this in a way that left you very confused about where you were. I think the only two hands you really need to worry about are 99 and 66. I doubt very much that the river Jack made anyone a straight unless they were on KT or T8 of clubs.

Your flop reraise is either way too big or way too small. If I am reading it correctly, when it came back around to you there was 39 in the pot. Your raise of 24 more made the pot 39+7+24 = 70, giving MP2 almost 3:1 to call and the cutoff 4:1 when MP2 called. Either or both of them could have been on some kind of draw and they might well have taken those odds. On the flop you need to either just call the raise and plan to c/r the turn or re-raise it bigger. That would tell you where you are in the hand.

By the time you get to the river, it is very hard to know where you are and there is no obvious line. One option is to lead for say, $250 but that basically commits you if someone raises. The other option is to check/call and hope nobody goes crazy.

Bottom line: you ended up in a tough spot because of your play on the flop.