The only possible reason for that is a faulty mouse. Try buying a new one or check to make sure that its on a flat surface or any other problem.
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if you download minecraft its laggy p.s. for all u guys
You press F5.
You should be able tto download it as soon as you've paid for it.
You can change your view by pressing F5.
Press button 'F5' for the other 2 view modes. Press 'F5' to switch views.