I had a bad session and wonder if I just sucked today or what.

Hand #1

Villain is very loose/weak and I just think this is standaed variance. Am I right?
http://www.pokerhand.org/?1573318

Hand #2

Villain is a typical donk at 61/7/1. The board is scary, but can I fold here?
http://www.pokerhand.org/?1573337

Hand #3
The villain in this case is 36/17/6. I can put him on a strong J, but ...
http://www.pokerhand.org/?157335

Hand #4
This one I should have seen. The villain is nittier than me. He plays 10/6/4. Feel free to kick my ass here. I am still kicking it.
http://www.pokerhand.org/?1573373

I ended up down 2 BI after all this mess, but what should/could I have done different?

Game 1 - Always unlucky when KK meets AA in a 6-seater. The warning signs were there with a re-re-re-raise pre flop, but tough to fold anyway.

Game 2 - Unlucky . he bet 1.25 into a $12 pot after Turn - U had to call. Am i missing seeing the River card ???

Game 3 - Dunno - dom't do Omaha (I finished 5th in a Tourney once when I entered by mistake - only had a vague idea what to do - based on watching the others and my Limit-hold'em skills! lol)

Game 4 - Ouch. U plonker ! Yep - u were beat post Flop, and you went on Tilt with the All-in. You know it - good luck next time.!