I know how you feel I'm gay and comming out is a difficult thing to do. I had the problem all through school and into my adult life. I'm now 46. I spent 10 years in the navy where you couldn't tell anyone or you get kicked out. The decision to come out or not is truely yours. How, when and to whom is something that you have some control over. If you decide to, I suggest that you do it one-on-one with only your closest friends. Later, when you are more comfortable, you can tell more friends. Be sure to set up the situation by telling them that you have something very serious to tell them. Tell them that you are really afraid to tell them because you don't want to loose their friendship. Then explain it to them. Don't just blurt ti out because they may react with shock. Setting it up as I said will prepare them for the seriousness of it and reduce the shock for them. It may take a couple of days or more for them to really get it and come to an understanding. However, if they are true friends they will realize that you are the same person you were before and that it doesn't matter. While people are more tollerant today than when I was 14, there are risks. Becareful not to let them hurt you, physically or emotionally. As far as comming out at church, most churches are very anti-gay and that is very risky. You must make that decision. You haven't said anything about yor parents. You may want to come out to them first so they don't find out from someone else. I would do that the same way as I suggested for your friends. Get them together at a quiet time without brothers or sisters there. Tell them that you love them and don't want to loose their love, but that you need to tell them something.
I have found that most people don't really care. I am out at my job, all men and more than 100 of them. No one has changed the way they work or talk to me. I do get some jokes and teasing but nothing that they intend to hurt me. I have answered many questions from them, they want to understand so they ask.
Young people in your age group can be very mean to people who are "different". They are very impressionable and adults do influnce their opinions on this issue. They also get very bad information from friends and older brothers and sisters.
Be careful and good luck! If you want to ask me more my e-mail is firstname.lastname@example.org I will not discuss sex with you, you need to talk to you parents about that or search for information on the web.