Every time I move my handle bar left or right the wheel turns in different direction I crashed my bike and now every time I push on the front wheel a little, or if I turn the handle bar a little hard the wheel turns in the other direction.

What could cause this and what can I do about it?
Sounds like the handlebar stem is loose. This is an extremely dangerous situation and you should go immediately (pushing your bike or taking it in a car, but not riding it) to your local bike shop to have it looked at.

The fix is easy and should take less than 5 minutes (and only a few dollars/euro if they charge you at all), but again it is critical that you get this repaired.