Every LGBTQIA person has a different coming out experience, and it's impossible to fully comprehend what it feels like unless you've been through it yourself. Even the most supportive straight people don't know what it feels like to live in a world that considers your sexual preference outside of the default, homophobic messaging is everywhere, and it can seriously affect self-perception.
That being said, it's conceptually easy to wonder why gay people leaving straight relationships don't "come out" earlier, or in more ideal settings, but each situation is complex. Some people may be bi or pan, and didn't realize the extent of their same sex attractions, while others take longer to embrace and accept their sexuality in general.
"AITA for refusing to go to my brother’s wedding to another man because he was married to a woman previously and had a son with her?"