let me sincerely try to answer ur concern 
whenever i buy food , i talk in such a soft voice until they cannot
hear .
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it is called paranoid ..it couldnt be a result of karma.. it is
more of insecurity of something or u are more introvert
whenever i walk into a toilet , i feel uncomfortable .
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perhaps u have bad experience in the toilet .. i cant said for
sure
i also have stage fright ......
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everyone have stage fright .. i was like u until i take up
story-telling competition
today going up the stage to speak isnt a problem
i like to talk and treat the audience as ppl who owe me money
(sources? look at dale carnegie book -how to win friends and
influence ppl )
is this karma ?