Disappointed

I have been playing a fair bit of $3-$6 NLHE 6-max on Full Tilt. As well as some $100 heads-up matches. I've done very well with the heads-up matches. But average at best at the cash game. That's due to my play. As written on the title of this post, I am disappointed in myself. In my cash game play that is. Over the past couple of weeks I have lost way too much money in marginal situations. I could spell it out to you like this...

*I raised preflop with AA and got called by the maniac. Flop is J-9-5. The Maniac has 9-5.
*I had A-K and went broke on a A-8-5-J-A board to a set, turn boat.
*I went broke with QQ to 10-7.. Flop 9-8-x. Turn garbage. River 6.
*I raise with KK.. Get one caller.. flop 8-8-9.. I bet.. he raises.. I reraise.. he shoves..... ahhh I fold.
*Worst of all, I basically decide to coin flip for 1K. After a series of raises. One guy who just called a small raise decides to reraise.. I thought from the way he played it he probably held JJ or QQ.. and not AA or KK. I shove all-in with A-K.. in a big pot with 4 way action preflop. Get called by QQ and board bricks out. This hand I was SO upset with. I mean what the hell am I doing flipping for a grand?? It's not a tournament, I should have waited for a better spot.
*And finally today. Guy limps.. next guy raises to $27. I reraise to $70 with AA. I get cold called by the limper?? Who happens to have 67o.. And Bingo, flop is 5-8-9.

A lot of people would just call this cold-decked and write it off. Well I mean the boards were "cold-decked" but I could have saved a lot more money on these hands. Well I'm not sure about the QQ hand.. I didn't go broke there or double him up. And I was ahead until the river there. And the KK hand I probably play that close to the same. But the first AA hand, both AK hands, and the most recent AA hand... I could have folded earlier in the hand and saved myself a lot of money. Both aces hands I was in the pot with the maniac at the table. So it makes those hands even harder to lay down. But I know I should have gotten away at some point. I know better than to over-value big pairs. It's something about this Internet thing that just makes it so much easier to put it in. I'm playing those big hands way too hard. Like I mentioned earlier, it's not a tournament. The blinds aren't going up. And I know this, I know better... that's what's eating me up. 95% of my poker playing is in cash games. I hardly play any tournaments(comparatively). I know I have to pick better spots. I've folded KK preflop a few times before, and have always been correct. I don't overplay this crap. That is until recently.

I've made nice money with sets, flushes, straights, etc. recently and pissed it away with big pairs. But I know.. the first tier is your money makers. And I have to keep that in mind. I'm just writing this to vent. I'm upset with myself. A little self evaluation should do a little good for my game at least.