How can I tell my mom I am bisexual?

I don't have a problem with being Bisexual. Yes, I am to young, but don't tell me that I can't be bisexual at 13. I'm pretty sure I was bisexual at 9. How can I tell my mom? I don't think she'll worry to much.. I had to have taken someones genes in the family to get this bisexual.
 
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