Why can't humans fly?
We have feathers and stuff but we don't use them. Why?
We have heavy bones and teeth, so it's too much weight to hold us in flight. As for feathers, do you mean the ones you buy from a craft store?? Because those in no way would help anything fly.
Lay off mushrooms...you DO NOT have feathers. Close the window.
You have no wings, and are to heavy! (Lay off the potato chips for a while)
The gravitational pull is pushing us down to Earth and we have no wings.