Should I have been more aggressive with this...??? Would you guys have folded anytime...?

Sorry if these seem like some noob questions... but fuck it... I'm a noob dammit!!!!!!!

PokerStars 2/4 Hold'em (9 handed)

Preflop: Hero is MP3 with , .
UTG calls, 3 folds, Hero raises, 3 folds, BB 3-bets, UTG folds, Hero calls.

Flop: (7.50 SB) , , (2 players)
BB bets, Hero raises, BB 3-bets, Hero calls.

Turn: (6.75 BB) (2 players)
BB bets, Hero calls.

River: (8.75 BB) (2 players)
BB bets, Hero calls.

Final Pot: 10.75 BB

Results in white below:
BB has Qh Qd (two pair, queens and jacks).
Hero has Kc Ks (two pair, kings and jacks).
Outcome: Hero wins 10.75 BB.

I would've capped it preflop, capped the flop, if he led the turn I'd raise and if he 3 bet I'd call down. Granted this is fairly aggressive, but you're only behind AA and AJ (I doubt he 3 bets AJ from the BB though since it doesnt appear to be a steal). If he has AA so be it, it happens 1:22 of your KK (I think). Otherwise you're missing out on some money.

i think that there are plenty of hands that bet this way that don't hold the J or 55 (many PPs, maybe the odd 5 in an SC hand or Axs hand), so I wouldn't fold.

unlike TG1, i don't think i would raise the turn. i like calling down as you did due to the fact that it _is_ possible that he has a J.

if the board was 55J, however, i would be tempted to be more aggressive along the lines of TG1's line. Villain is very unlikely to hold a 5.