joker, you need to understand a few things such as "utility". if you fold and still make day 2, so what, your aim is to make the final table, and to do this you need to take risks to get chips. if you are not willing to gamble, then tourneys are not for you.
This is a situation, when if the opponent has a bigger pair, then so be it, and they would of isolated the other guy anyway, so your jacks are good.