This thread should be moved to General Chess. Anywho...
You only play blitz! That's part of your problem. You don't allow yourself enough time to think and look at moves! No wonder you only win 20% of the time. Play a few 10 minute games and post them here with your own thoughts as to how you did.

i know the basic rules of chess and have practised for 2 years but still i cannot give a statement to any player of chess .com . please give me tips and any other thing that will make my game better.