I agree completely with Katie - go to a therapist or counselor in your area. Remember you are in control of that interaction - only share what you feel you can safely. The balancing factor of that is you will only benefit as much as you are willing/able to be open.
Self discovery, forums, and other online resources can be helpful to a point. But in the end, the work is uniquely yours to discover the truth in your life. Nobody here or elsewhere can know what is inside your head and heart. Having someone you can built trust in to help probe and guide you as discover your truth is invaluable.
Another thing to consider as you engage therapy is insurance and medical record disclosure laws. Once gender dysphoria is shared, your therapist can add a diagnosis code which will show up in your medical records and insurance billing. If you are a minor, your parents will likely find this out eventually. If you are an adult/professional on your own insurance, there is a chance someone in your company HR may see this billing code at some point (especially in a small company).