With your image you dont need to be making big laydowns. LAGs make alot of profit by making people play back at them with TPTK when they hold 2 pair or better.

Second best hands also hurt alot more in NL than in limit. In Limit you pretty much never fold a hand that *might* be good BECAUSE THE POT IS SO BIG. In NL, the pot is rarely much bigger than the bet size. Because of this you have to fold much stronger (losing) hands than you could in Limit.

e.g. Hand 2 you have tiny TPTK and a backdoor flush draw in a tiny pot. You dont want the pot getting much bigger unless this guy is retarded. If it does, you are behind. A checkraise is interesting, and not a bad play if you think hell take a stab and fold but once he calls you should just give up IMO. Youve missed the flush and the T means any hand that you were beating now has at least a straight draw.

Hand 4 is another similar situation. If you have a read that he will call down with a missed PP and bluff the river then good for you. But I think he was either ahead of you the whole time, or that river catches him up alot of the time. Id usually fold to the allin.

Hand 5 he could have a higher set or some sort of combo draw or even and over pair or this could just be your image paying you off. This is a really tough hand IMO. I dont think you did too much wrong. Id usually call but only because I suck at laying down sets and there is so little behind. I think you need a read to lay it down with your image though.

Hand 6 I dont understand why you call the river here. If he doesnt have a flush he has a higher A or a set or something. Good turn check but just giver up that river. No way are you good 20% of the time here.

Hand 7 That flop bet is really a steal and overbetting isnt giving you good odds to carry it off. This is one of those situations where the pot is tiny and I dont care about it. Either you are behind now or theres a good chance you will be soon. I might check/fold the flop or I might make it $3 and give up afterwards.

Hand 8. Meh. Cards sucked.

These are all just my opinions and I dont tend to play shorthanded so im likely to be more conservative than most. I think your main issue is pot control with weak hands though.
Ive recently discovered the secret to NL hold'em and it is this.

"Play big pots with big hands and small pots with small hands".

Learn that and youve mastered poker.