1 & 2) Acceptable grammatically, but both sentences sound pretty crazy.
3) This is closer to what you're trying to say, but I'd write it like this:
"I am trying to cut down on my Internet usage."
4) The second sentence makes sense, but it's a little awkward. My suggestion:
"You will run many people over if you drive it."
5) I'm not sure what you're trying to say here. Do you mean that you're playfully punching someone?
Student or Learner