I want to express a different side to this issue. Everyone seems to offer a supportive comment. I want to as well. But, I will tell you that it doesn't always go well when you tell your parents these things, so you should prepare yourself for rejection also. First I will tell you that I am gay. That way you know that I am speaking from experience. I came out to my parents later in my life. Around 35-40 years old. I'm sure that they must have known all along, but because of their desire to not believe this was the case they helped me to keep it from them. You know how it goes: "Don't tell me something I don't want to hear.". I spent most of my life involved in religion and denying my sexuality. I had a couple of whirlwind affairs that most people in my sphere never knew of. When I was forced into revealing my sexuality I lost many friends and the support of my church, but I did not lose my contact and support from God. I say that I was forced into revealing it because after so many years of trying to over-achieve to get people to like me in spite of my orientation( which was always figured out by associates after a time) I started to have panic attacks and insomnia. I went to Dr. after Dr. trying to find out what was wrong and eventually had to seek the help of a psychiatrist. After spilling out the truth, that Dr. told me that unless I changed my way of interacting with others I would not get better. In specific terms, if I didn't start being who I was and telling that to others, then there was no hope of relieving the stress that I was under. Reluctantly I began to practice her advice. My own parents didn't take it so well. Never-the-less, I had to prepare myself for the rejection of them as well as others in society. It wasn't easy. I didn't come through it unscathed either. But, as it turned out, my parents eventually accepted it and me. But, I know that they will never wholeheartedly support me in it. Oh, I forgot to mention that my dad is a preacher, and I was going to be a preacher, except..you can imagine the criticism I received. Of course I had to re-group.
The crux of the matter is in self-acceptance. I, myself, am not characteristically gay( I guess) and can easily pass as a heterosexual. Except I cannot date or otherwise involve myself in hetero relationships. But, the majority of people seem to be opposed to my orientation, whether or not I am involved with someone. I will tell you this, don't follow the path I took: trying to deceive people into thinking I was hetero. It only leads to more and more isolation and deception and self-hatred. Since I have accepted that I am homosexual and just as good( or better) a person as anyone else, and have decided to be more honest and truthful about what is going on behind my game face, I have made much better and deeper relationships with people who want to be friends with the real me. I also think that peole who openly reject me secretly admire me for my courage and honesty. Good luck to you.