Did I play these hands too far? When to fold

Well I think my biggest leak in my game is knowing when to lay it down. I dont have a problem winning alot of hands, im aggressive and about a 21% VP$IP player with 14% PFR and i take down most pots on the flop.

I think most of my profit comes from winning tons of small little pots time after time, but when someone plays at me, I seem to lose more money than I feel I should.

Example hands:

1)Where would you have laid this down or is seeing the river such a bad thing cause if i spike a pair I will take down a pot.

Opponent plays 40% of hands, and has a avg type aggression, PFR 7%, not horribly passive or aggressive.
$25 NL Texas Hold'em - Wednesday, January 04, 16:45:09 EDT 2006
Table Table 65128 (6 max) (Real Money)
Seat 5 is the button
Total number of players : 6
Seat 1: msdebster ( $25 )
Seat 2: Kalkkuna ( $13.80 )
Seat 3: slave2105 ( $20.35 )
Seat 5: tedixp ( $36.05 )
Seat 6: AceRagRules ( $98.25 )
Seat 4: AidanN20 ( $19.95 )
AceRagRules posts small blind [$0.10].
msdebster posts big blind [$0.25].
** Dealing down cards **
Dealt to AidanN20 [ Qd Ac ]
Kalkkuna folds.
slave2105 raises [$0.50].
AidanN20 raises [$2].
tedixp folds.
AceRagRules folds.
msdebster folds.
slave2105 calls [$1.50].
** Dealing Flop ** [ 2c, 7h, 4c ]
slave2105 bets [$3].
AidanN20 calls [$3].
** Dealing Turn ** [ Js ]
slave2105 bets [$3].
AidanN20 calls [$3].
** Dealing River ** [ 3h ]
slave2105 bets [$4].
AidanN20 folds.
slave2105 does not show cards.
slave2105 wins $19.55

Im not sure if im over valuing my KQ or just what to do sometimes on these type hands. It appears he hit the flush or maybe has two pair on QJ??

My question here is should I have laid it down against the turn raise?
2) $25 NL Texas Hold'em - Monday, January 02, 15:15:10 EDT 2006
Table Table 69900 (6 max) (Real Money)
Seat 6 is the button
Total number of players : 5
Seat 1: kittedim ( $44.35 )
Seat 2: edbangsu ( $61.33 )
Seat 3: AidanN20 ( $32.14 )
Seat 4: Mattster53 ( $26.70 )
Seat 6: gaga007 ( $25.35 )
kittedim posts small blind [$0.10].
edbangsu posts big blind [$0.25].
** Dealing down cards **
Dealt to AidanN20 [ Qd Ks ]
AidanN20 raises [$1].
Mattster53 calls [$1].
gaga007 calls [$1].
kittedim folds.
edbangsu folds.
** Dealing Flop ** [ 4s, Qh, Jd ]
AidanN20 bets [$3].
Mattster53 calls [$3].
gaga007 folds.
** Dealing Turn ** [ 7h ]
AidanN20 bets [$5].
Mattster53 raises [$10].
AidanN20 calls [$5].
** Dealing River ** [ 7s ]
AidanN20 checks.
edbangsu: aidan lose it 2 him
Mattster53 is all-In.
edbangsu: so i can get it back
AidanN20 folds.
Mattster53 does not show cards.
Mattster53 wins $40.60

3) This hand i lost a bunch on...I know i made a big mistake not raising preflop, I was just trying to mix it up a little. I also should have raised the flop and reped top pair.

Table Table 65867 (6 max) (Real Money)
Seat 3 is the button
Total number of players : 6
Seat 1: RedWholf ( $44.36 )
Seat 2: AidanN20 ( $41.70 )
Seat 3: vorpaw ( $43.51 )
Seat 5: scaredstr854 ( $18.85 )
Seat 4: AreC9 ( $25.10 )
Seat 6: gandydancer2 ( $24.75 )
AreC9 posts small blind [$0.10].
scaredstr854 posts big blind [$0.25].
** Dealing down cards **
Dealt to AidanN20 [ Ad Kh ]
gandydancer2 raises [$0.50].
RedWholf calls [$0.50].
AidanN20 calls [$0.50].
vorpaw folds.
AreC9 folds.
scaredstr854 calls [$0.25].
** Dealing Flop ** [ 8c, 7s, Qh ]
scaredstr854 checks.
gandydancer2 bets [$0.25].
RedWholf folds.
AidanN20 calls [$0.25].
scaredstr854 calls [$0.25].
** Dealing Turn ** [ Th ]
scaredstr854 checks.
gandydancer2 bets [$1].
AidanN20 calls [$1].
scaredstr854 calls [$1].
** Dealing River ** [ 7h ]
>You have options at Table 69900 (6 max) Table!.
scaredstr854 checks.
gandydancer2 checks.
AidanN20 bets [$10].
scaredstr854 is all-In.
gandydancer2 folds.
AidanN20 folds.
>You have options at Table 69900 (6 max) Table!.
scaredstr854 does not show cards.
scaredstr854 wins $31.70
damn

In think your problem could be that you try and win every pot when that just isnt possible. You call all the way down with nothing and then when your runner-runner "flush" hits you massivly overbet. i dont mind seeing 1 more card on the flop when they only minbet, but on the turn when the betting gets serious you have 6 outs with a chance that someone else will make a flush if the A comes. Why not just fold that turn. It's a pretty small pot and your chances of taking it are also pretty small.

Hand 1 - you have position on him. A standard line for me here would be to call the flop bet and raise on the turn. He projects weakness by betting the same amount again, so rep the jack or an overpair and raise it to $10 or something like that. If you're not going to play it that way, I don't like chasing after six outs; your flop call is pretty bad for a six outer. Overcards are not a good draw. To stay in this hand you need to mix in some aggression and actively steal the pot from him. Otherwise just fold on the flop. He hit (or has a medium pocket pair) and you missed... let it go.

Hand 2 - tough hand, I usually play it like you did. There's a good case for folding to those turn min-raises unless you have a read that says the opponent might bluff that way. His line oozes strength. Good river fold, anyway.

Hand 3 - I don't like the way you played this hand. Re-raise pre-flop. If you're mixing it up with AK and you miss, you should usually default into a "call small bets, fold to big bets" mode. I don't mind stabbing at the pot on the river, but the overbet is silly - the pot's in the ballpark of $5 and you're betting $10 to try to take it down? Terrible risk/reward. Bet $3 there (it's by far the biggest bet that has been fired at that pot) and you might take it down often enough for it to be profitable.