It is so hard to pedal that I need someone to push me to start the engine and if I stop the engine turns off and I have to be pushed again can someone help me
Like @Spare_Parts said check the clutch. It sounds like it's always engaged. You should be able to pedal like a normal bike when the clutch lever is pulled in.
I'd like to add, it won't be AS easy as pedaling a normal bicycle, but a little bit harder still, because you are spinning an other, low quality china heavy chain, and a sprocket.
One of my bikes is a bugger to pedal I suggest go to the right side of your carburetor or maybe left find the idle screw turn up the idle to prevent it from dying.
It is so hard to pedal that I need someone to push me to start the engine and if I stop the engine turns off and I have to be pushed again can someone help me