Call your CTA staff representative. He or she can help you seek all available remedies, including referring you to a CTA Group Legal Services attorney. They can also be valuable in getting support systems in place for you.
Consider filing a charge of discrimination with the California Department of Fair Employment and Housing, the administrative agency that enforces the Fair Employment and Housing Act, Gov't. Code §12940, et seq. Filing such a charge may be a procedural requirement for filing a complaint in court. Charges must be filed within one year of when the employee first knew of the discriminatory event.
Take a representative with you to all meetings with your supervisor if you believe those meetings relate to your sexual orientation.
Document meetings, harassment, or other examples of discriminatory treatment. This includes harassment by co-workers and by parents. Your employer has a duty to stop co-worker harassment.
Bring your complaint to the governing board of your school district through its internal complaint procedures.
If you are being harassed by co-workers, treat this like sexual harassment. Complain to your supervisor and hold him/her accountable for stopping the harassment.
File a grievance if your collective bargaining agreement contains a nondiscrimination clause on the basis of sexual orientation.