When I was in 6th grade or so, I knew I was different. I probably knew ahead of time, but I didn't know what to call it.
I knew I liked boys, but then I was quickly admiring girls and models on television and I would find myself picking out girls I liked more than the boys, of course (all in my own head) I tried telling my mom when I was 13, that I thought I liked both, but she was accepting, yet didn't want me to say anything else until I was older, so I wouldn't be judged.
So I kept it a secret from family and most friends, but I was getting sick of hiding who I was, and little by little I would tell a friend. And then, I started dropping hints to my family, by hints I mean, I tried to say something, but couldn't. But my sophomore year, I became president of my high school's Gay-Straight-Alliance and wanted to go to an LGBT prom.
Recently, about 3 weeks ago, I was tired of being myself around my friends but not my family, so I sat down with my mom and told her I was very sure, I was bisexual. And she accepted me, she told my dad and I am the happiest person I've ever been.