I was straight, or at least thought I was, for about 21 years of my life, from birth until some time after I got 21, which was last year. Some time last year, I felt a little confused, I think. Or rather, bi-curious. It was an interesting thought to me to be with another man, while still being attracted to women. A few weeks after that, I realized I was bisexual. A few weeks after realizing that, I did some thinking and realized that I am pansexual. I don't know if I am truly attracted to everyone, but I still am quite capable of being with anyone, should I feel interested in being with them.
As was said before in this thread, it's not really the label that matters to me, but knowing myself does. I don't care if omni and pan are the same thing, I see myself as pan, I understand myself as someone that's pan and that's final.