Everyone learns at different times. I knew I liked women from the time when I was old enough to process being attracted to anyone, and because my mom came out around that same time, I always identified that way from a young age... even though it always seemed to me that if there was a man who was attracted to me, well, I'd be flattered, I'm not opposed to the idea, but that's normal, right? It wasn't until my early 30s that I realized I was actually bisexual, even if I still lean toward women and lesbian relationships most of the time. We all are growing and learning at our own pace, and the idea that you need to figure it out from early life for it to be valid is just nonsensical.