Hey HappyGirlTea, Birdy knows her stuff for sure! Always has kind and support words of advice.
I too have been where you are right now - though much older (I have a son almost your age!). I came out to my wife, kids, family and friends over the last 5 months. It was extremely difficult thing to do, I'd built up walls of protection all my life, until they fell down and exposing the pain I'd felt for such a long time.
My parents are in their 70's, and last year we had an argument over the same sex marriage vote, they always made remarks of disgust about gay people and it always upset me. I am very close to them, love them dearly, and I was scared out of my pants that they would not be okay with me being gay.
Well I was completely wrong. It turns out that they did not care. They loved me for me. They were upset and angry, at themselves as they felt that their uneducated and bigoted comments had made it hard for me. It had, but I love them anyway.
My point is that don't sell your loved ones short. Don't feel that you need to tell them anything either. You need to be 100% happy and ready to do whatever you need. Don't worry about labels either, they don't matter.
I've now just about told everyone that I care about - and I have not had one single negative comment or sideways glance. Everyone has smiled at me, told me how brave I am, congratulated me, hugged me and told me how happy they are that I can now be true to myself. Frankly it is a little overwhelming.
And I say almost daily - why the heck didn't I do it years ago!!!
It may feel strange talking to people on here, especially ones that may be older (and male!) but we were once kids too. We've been where you are right now, the fear and uncertainty.
One of the things I did over the last few months, to help me cope with all the pain, was to write. I have just finished my first novel - it is about 2 high school boys "coming out" and it was all the emotions/fears/ confusion/self loathing that I had experienced over the years.
There is an peer counselling service called QLIFE, google them. They can offer you some phone support. It is anonymous, so you don't need to feel too awkward (yes easier said than done though!). Also there are LGBT groups you can look up to make new friends too. I found some by googling TEAM MELBOURNE - there is one in all the capital cities depending on where you are, just change the city.
I hope I've offered you something that may help. Good luck and don't forget to smile.