Im a 16 year old guy an I know for a fact that I'm bi but I don't know how to tell people I feel as though I need to so I know who my true friends are but I am terrified that people won't accept me to the point that I'm starting to think I shouldn't but I feel that I need to and get this load off my chest and be who I am around everyone not just my immediate family

First of all, your sexuality is still developing. I don't think you should label yourelf at this age. Wait until you're in your late teens or early twenties -- things may change.

You don't find "true friends" by announcing your sexual preference. How will being bi, straight, or gay make any difference in who you are anyway? Are you honest? Kind to others? Intelligent? Sharing and caring? Those things tell people who you are, not your sexual orientation.