What to do here?

[FeVeR]

I'm a relatively new player. Live tournament. 50 + 5. Everyone starts with 1500 chips, I have 1200. 15 players left, 7 at my table. Top 6 pay. Blinds are 50/100. I'm on small blind and get dealt JJ. UTG folds. UTG + 1 has ~900 chips and calls. UTG + 2 folds. UTG + 3 has ~1800 chips and raises to 300. Button folds. I reraised to 900 chips (I know you're gonna grill me already on this). BB has ~1300 chips and reraises again all in. UTG + 1 folds. UTG + 3 folds. What do you do? I figured there is no way I'm ahead here but if I fold now I'm down to 400 chips and basically fodder for the rest of the players at that point. Fold it and hope to double up a few times? Call it and pray for a jack? After I get a few responses I'll tell you what happened.