Letting go of KK here?
 

Pokerroom 20+2
Blinds 15/30 all stack sizes almost equal (1400-1600), except Villain who had doubled up on a coinflip.

Hero is dealt KdKc UTG
hero raise to 100, MP2 calls, CO (villain) calls, rest folds.
Flop (pot 345) TdJd4c
Hero bets 300, MP2 folds, Villain calls.
Turn is Ad.
Hero ????

I got scared and only bet like 125, and got a re-raise all in from villain. I realize I got outs for both the flush and straight and set, but what to do? Do I call his push?