Julian is correct, I noticed you never hotkeyed any units, I assume you don't know how? To create a control group press CTRL + a number to add only what you have selected to that control group, or Shift + a number to add new stuff and keep the old. Example, if you select 10 marines, pressing ctrl+1 would add them to control group 1, so you could tap 1 and it would select all the marines, or double tap and it'll center them on your screen, if a new marine pops out you can select just it and press shift+1 to add it to that control group, or ctrl+1 and it will be the only unit in that group. It also works with buildings.
Another thing I noticed was that you were queuing stuff up in your barracks, instead of queuing build more production buildings, so you can build more stuff at a time. Queued units are just minerals/gas that are gone but not being used for anything.
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