Hand #1: is fine. You get it in PF if you can with AA everytime. Don't worry about it.

Hand #2: What are you trying to do on this turn by shoving? If he has any piece of this board he's got you dominated. I understand your flop bet, maybe make it a little closer to pot like $2.50-$2.75, but that's beside the point. You really need think about just check/calling a small bet, or check/folding to a bigger bet here.

Hand #3: Yea it IS a good thing that you were short stacked I guess, but obviously just variance; nothing you can do.

Hand #4: You didn't post results, but obviously you lost I'm guessing. Um... I don't think it's OBVIOUS you are beat, but you aren't going to value out of worse hands very often I don't think by open shoving the river. Maybe you get a terribly played 4 to call, but who knows? Maybe bet pot or close to it.