First off, it’s important to give meaning to the phrase “coming out.” Coming out means that a person who identifies as a sexual or gender minority- as in gay, lesbian, bisexual, transgender, queer, and so on- lets others know their identity.
People describe it as being stuck inside their own personal hell. And there's a lot of truth to that. It's an endless stream of thoughts about worst-case scenarios, what-ifs, past events where you may have said that one thing wrong, and 10 years in the future when xyz might happen. It's incessant.