http://day9tv.blip.tv/file/3732340/
Watch that video. It will answer all your questions.
To highlight the main points he makes, it's all about macro play. Make sure you are always building a new worker. As soon as the last one finishes, build a new one. If you have way too many, expand and split them up.
Make sure you have enough production buildings so that you can build your army quickly enough. You should never have to queue units and always be able to spend all your money (which should be plentiful since you're always building workers). Hotkey all your production buildings and get in the habit of cycling through them to see which are idle, and then make sure you un-idle them as soon as possible.
Make sure to watch your supply and build quickly enough so you never get supply blocked. You always want to be building new units.
+1 for the dream analogy!
Like dreams, there is a good explanation of why you are living your game in slow motion, there is always one thing slowing down everything else. In the case of dreams, it is your brain, that actually dreams faster than your perception. That's why you seem to be slow, because the dream is actually faster than what you perceive.
For StarCraft, this is another problem. I discovered by studying replays that faster players remove one very large part of the time you may take in your game: controlling the army.
As an unexperienced player, you might not be familiar with unit balance. So when sending your 12 zerglings againts those 4 zealots, you don't yet know the outcome. I'm sure you expect some victory, but can you trust this expectation enough to actually leave your zerglings do the work without you?
I often find myself microing too much when dealing with large overpowered army. Yeah, I have 24 zerglings and they meet 1 zealot. Really, no need to micro them, just return and take care of your base!
Your problem may be the same...
Best Answer
I'm glad you asked.
Massive units can break force fields by walking over them!
Enjoy the power of the Ultralisk, the Colossus and the Thor!
edit: its worth noting that you could burrow under force field with Roaches or Infestors.