by your posts it seemed that you were not a previous CG125 owner.
the CG125E clutch is harder due to powerful pressure plate springs and the accelerator was even harder on old models due to a fatter spring lifting a bigger slide in the carby, it also had a small kick which reduced the torque you applied from your foot. It also was pretty jerky and raw in the low rpm - think of it as dumping a lot of torque as you released the clutch.
The newer models are very tame and easy, easy to start with longer kick pedal, softer and manageable controls, smoother power delivery etc. You will get used to it.
As chaudhary007 mentions - get the engine tuned correctly, have the mechanic inspect the lower rockers and replace as necessary. They are usually overlooked in such symptoms.