In formula F1 car, air coming infront of the car goes up with very high velocity as a result pressure difference is created which is very high from Bernoulli theorem.. The F1 car is very light so Bernoulli theorem suggest that instead of moving in the road, the car should fly out in the air.. What is wrong here ? Don't give answer like because the car is heavy. It is lightest car and its speed is nearly to the speed of some plane..
Your assumption that there is a significant pressure differential due to fluid dynamics is correct. The assumption that it is a lifting force is not. An airplane generates lift because it has been engineered with lift in mind. An F1 car actually generates a powerful down force to push it against the track, allowing it to get better traction than it otherwise would be able to achieve with gravity alone.
Most of the effort and engineering into the aerodynamics of F1 cars is in trying to find the right balance between aerodynamic drag and the down force generated. If too much down force is generated then the drag on the car is too high.
Check out http://www.formula1-dictionary.net/downforce.html and specifically their comparison between lift:
And down force:
There are a great many more resources on the web that delve into F1 car aerodynamics.
The component in the car that creates the down force is called the spoiler. Additionally, "skirts" in front of the front-wheels also create down force. Both of these components are essential so that as the car moves the down force remains balanced and doesn't pitch.