I'm suicidal over a secret I can't tell anyone.
What's your secret that you can't tell anyone?
My secret is that I like girls and I'm afraid my friends will laugh at me if they find out.
There are therapists that can help you out. This is not something to commit suicide over. They will keep your secret safe and can work through your thoughts.
This is exactly what I was thinking. I'm going to tell everyone that I'm gay because I have nothing to lose now.
You should contact a therapist before doing so. There is no telling how your friends will react, I don't want their reactions to cause you any harm.