If you're still at school, is there a counselor or other confidential resource you have access to that can support you? To have a support network in place before coming out can be useful, even if you hopefully don't need it.
I don't think there is an easy way of doing it, but when telling people, I tried to ensure they were in a private and comfortable space, so they could express their feelings openly (good or bad).
I'm alot older, and I was 38 when I told my parents, I gave them both a copy of a letter explaining my feelings, and waited patiently to answer their questions.
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