For me, well...it's a little complicated xD
I thought I was straight, dated some guys, got scared.
At the age of 18, I started dating girls, dated three of them. Thought I was a lesbian, but I never wanted to do more than just hang out with them, and I only held their hands, and never even kissed one, I was too scared.
When I came out as trans, I tried dating a guy, he was bi. But I hated it because he said it accepted me as trans, and then he kept treating me as a girl, so I broke it off.
I went back to dating girls, but didn't actually date another until a week ago. It was a weird 4 long day thing, she came from another state to see me. By day 3, she was holding my hand, and I felt...nothing. I realized, I have a lot of crushes on other men, so it seems more appropriate to say that I'm gay. So...now I identify as gay instead.