First, are you holding your steering wheel correctly? Are you
turning with the correct technique. Ideally, you should use the
push and pull method. Coordinate both your hands when you turn the
steering wheel. If you're using power steering, practice turning
while the car is stationary. When you're comfortable with turning
the wheels, try negotiating bends at a slow speed.
Did your front or back wheels hit the kerb? Either way, you're
turning too early or too close to the kerb while turning or both.
Make sure you leave enough gap while turning. The key here is to
visualize where the four wheels are.
HTH.