Everyone’s different, so there isn’t really a “should do” if someone thinks they’re gay, just like there isn’t really a “should do” if they think they’re straight. However, many people find it helps to learn more about what being gay means to them, so they might look for information and support. Some people choose to tell, or come out to other people. Some people come out only to people they know will be ok with it; some only tell people they’re closest to; some tell pretty much everyone and some never tell anyone.
If a person is worried about their safety when they tell someone, it’s important they speak with a professional support person, like a guidance counsellor. Together they can come up with a safety plan for this conversation. A safety plan may include telling someone in a public location.
For more information: LGBTQ Students: A guide for counsellors