I know how you can decide what you do in your dream in just a few weeks.
At some points a day , like every 2-3 hours , stop everything you are doing.
Look around.
Think of your surroundings.
Is it possible they look like that?
Look at what is going on.
Does it make sense?
Do that everyday for 2-3 weeks , and you'll start doing that automatically.
And after those 3 weeks , thats going to happen at night.
And at night you conclude you are dreaming.
Yey , do whatever you want.
This is actually scientificall proven to work , and tried out on 5 peopole.