spaceman -
These are my thoughts as I'm watching. I play Protoss, so take my advice for what it's worth.
1. As soon as the game starts, send workers to minerals, start an SCV, and since your Command Center will be selected, right click your mineral line to rally your SCVs to the minerals automatically. (Good job on the initial CC hotkey, very nice). As you get used to it and it becomes automatic, you can start rallying the first and second SCVs to the mineral patches that are empty, then rally back to the middle.
2. Normal opening for Terran is the first depot on 10 supply. Since the only other thing you'll be doing up to that is making SCVs, you can just spam your "S" key so that your SCV will start as soon as you have 50 minerals.
2a. Since your first depot is at 10 supply, get your SCVs queued up as soon as you have those 50 minerals. Send your SCV early to the point you want to make your depot so that right at 10 supply and 100 minerals you can get it started.
3. You put down your depot at 9. Put it down at 10.
4. Keeping up with your SCVs is important, along with keeping your minerals down.
4a. You put down your first barracks early. Standard is at 12 supply. Not a huge deal at this point. As soon as you put down your barracks, put it in a control group and set your rally point to wherever you want your units to go.
5. Need to keep making SCVs. You should never stop. This will enhance your economy a lot.
5a. I believe the standard for a refinery is at 13 supply. You're getting these buildings out without making SCVs, which is hurting your economy. As soon as your refinery is done, immediately put 2 more SCVs on it. What I like to do is "click-drag over my mineral line to select a few workers, if I have more than I need I will 'shift-click' the picture on the bottom center to deselect them, then I will right click my gas, then click "C" so that if I picked any that have minerals, they will return the minerals first before going to the gas." NOTE: You always want 3 workers on each gas so try to get them on there asap.
6. As soon as your barracks is down, get a marine. This should happen at 15 supply if you're doing it efficiently. Also, at the same time, (15 supply) get your orbital command. After your first marine comes out you can usually get a tech lab at this time.
6a. Then your second supply depot at 16.
7. As soon as your orbital command is up, throw down a MULE onto your minerals.
8. If you put all of your barracks on a control group, you can constantly be producing units. Also, if you double click one, that will select them all, then you can right click to rally them all to the same point. You can also right-click a unit and your new units will rally to where ever that old unit is at.
9. Around 11:15, try to not let your units get separated like that. That is a recipe for disaster if he had been moving out too. Also, when you get to his base, try to regroup before going near the ramp. Not having all of your units there puts the advantage into his favor.
10. If you had your units on a control group (let's say 1), you could just "1 > A-left click behind his bunker and all of your units would attack. If you see that some units are stuck in the back and aren't firing, right-click your units up closer, then attack-click again, or you can right-click focus fire.
11. The next attack you were bottle necked on his ramp while he had a nice concave so that all of his units were attacking you. Best to retreat at that point. Another thing, on Jungle Basin, you could go around and break down his rocks and attack his expansion or surprise him from behind.
Your last push into his base, you had him supply blocked and since you were 1-1 with upgrades, you had the slight advantage over him. You would have beaten him even if he retreated the little bit of army that he had left, along with like 2-3 units that he forgot were sitting near your back rocks. His opening build wasn't as good as yours was. You were better than him whether you believe that or not.
I always like going into a custom game and playing against the AI to work on my builds and efficiency with my hotkeys/control groups. You can use that to practice.
I would suggest watching this:
http://www.justin.tv/trumpsc/b/276046132 That is Trump (from 2p2) coaching a Platinum level player. You may pick up on some good information here. Hurry up and watch it before it disappears!