8: R16 says that you are going to play for influence in that corner. O16 confirms that. Then S16 totally reverses direction and says that you're going for territory. If you keep doing this, your stones will suffer from whiplash.
P14 is a tad unreasonable for him. It gives him no grip on eye space, yet half of his stones are invested there. I would cap with N14 or pincer.
10: Your timing is good here, I think. One more move and he might get too strong a position on the right.
11-15: A terrible sequence by him, virtually forcing you to make life right in the middle of his strong side.
18+20: As long as you can be sure that 18 ensures the second eye, I think 20 is a great tenuki.
22: Remember the proverb about hane at the head of two stones without looking? Well, here you are giving him a position in which he can follow the proverb, making obious and easy strong moves.
I like Karaklis' suggestion of E3.
28: Re-read Karaklis' opinion of E6.
I couldn't say it any better.
36: You just burned a ko threat, and forced him to bcome stronger. Who got the better of this exchange?
38: You're way too thin here. You want quick profit? D10 or C10 gets a bunch.
46: How many points is this worth? He has eye space in the corner, so capturing F18 is small for him. Imagine something like D10 or G15 or K3. Heck, even S10 is bigger.
48: Quit playing with your food. Try D12 or E13. But don't touch the stone that you are attacking until it is time to actually shut down liberties.
50: The black stones over on the left are weak, heavy, eyeless and friendless. You should be thinking of making them suffer. Instead, despite the fact that you outnumber them about 4 to 1, you seem to have decided that they are a threat, and you must connect underneath them for your own safety.
52: If you must play ultra-defensively like this, at least B10 is better shape.
54: Yes! Good move!
72: Locally, you are way to strong for a move this tepid. If you want to jump to the center, a 2- or even a 3-spce jump will work.
102+104: What is the point of supporting a lone cutting stone when the stones on both side of it are alive?
144: T12 leads to a ko, either on one side or the other. It is worth about 70 points.
Summary: You are playing way too conservatively. You make lots of good moves, but then you back down when the stakes rise. Go eat some raw meat prior to your next game.
This is what the empty board should look like to you when you sit down for your next game:

Think of it as 361 places where you can kill something.