Thanks for choosing health care magic for posting your query.
You seem to be having some anxiety
issues and you are especially stressed out by someone or something specific in school. May be you can just discuss these issues with your friend. You should visit a psychiatrist
who can help you with this problems by prescribing you anti anxiety drugs which you can take just before going to school.
Hope I have answered your query. I will be more than happy to help you if you need any further clarifications.
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Wish you a good health!