Sexual orientation is not something teens choose, and for teens who are struggling in families without support or even tolerance, there is always someone to help. Teens can reach out to an adult who will help - a teacher, a relative, a doctor, a clergy member, or a counselor.
There are also national hotlines: The Trevor Helpline is a nationwide 24-hour helpline for lesbian, gay, bisexual, transgender and questioning youth. The number is 866-488-7386. There is also a web site for the Trevor Project.