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Since you are under 18 it can be a very confusing difficult time. Just be aware that once you come out to even one person there is a chance that EVERYONE can find out.
When I was in high school there were a lot of girls that were uncomfortable with bi girls and guys were also very skeptical and homophobic even if they were still technically bi not gay. Just make sure you are emotionally and mentally ready for a bad outcome. Hope for the best but expect the worst.