Thanks for posting the hand Alexblefer. It's an interesting one.
The hand has all the hallmarks of the freeroll-microstakes game play: 5 players in a family pot; everyone limping or checking; first to act seemingly taking a random 1/2 pot bet at the pot; and the best hand limping and minimum betting on the turn. What's not to like?
In a way it's unfortunate that you were in the BB with such a marginal hand opp and with no additional cost to you to stay in the pot. If we calculate the gross
equity of each player (assuming 2 players had 30% ranges and two player had 20% ranges), your equity preflop was ~15%. On the flop, it was still only ~26%. If folded on the flop, you would have dodged the bullet.
The way the button with JJ played the hand, it was nearly impossible to put the villain on a narrow range, and the way they bet the turn when checked to them further disguised their hand. (I did find their min bet into such an inflated pot a bit suspicious though.) The Jc turn was the killer. If you could've have gotten away on the flop, you would have been pretty happy. However, the turn was increasing your equity against a 20% & 30% range.
Overall, I wouldn't get too upset by this hand. It's just poker. We all need to review our flop strategies, and this hand provides a good opportunity to do so. Good luck on the felt.