Can we ever fail to identify our self ? What is the basis of our identity?

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What if you meet your clone. Ok thats interesting but what if your clone claims that he is you? YOU can take rescue of your memory and life history to prove it but what if your clone is smart enough and you fail to prove that he is not you. In that case no body else except you may know that you are you. Big question is how do we identify our self? This is that self for which we work hard day and night to keep it happy. The self which we say myself. What if you make mistake in identifying yourself ? Have thought something mad like this? A blind person who has never seen his face and body also knows that he is he. What is the basis of our identity. Which part of our body?