I came to the conclusion of being bisexual by realizing I was sexually attracted to both men and women. Physically, I prefer women over men, but not by much. Emotionally, I prefer men.
I had always noticed girls in a way I don't think a straight girl would. Then as I got older, I started having female crushes. This led me to really question my sexuality. Then I had one crush, who I fell for. It was then I realized that I was bi. I had also always been open to the idea of not being straight. I don't really know which I like better in certain ways. I used to like guys a good amount more, but I like guys and girls almost equally now. I think I like men more physically but girls more emotionally.
I don't remember a time where I wasn't both physically and romantically attracted to men and women. I am attracted to both male and female equally in every way.