Welcome to Susan's, Vrony.

First, some business:
Be sure to look under the Announcements heading. There you will find the rules we live by in this little world of ours: "Site Terms of Service and Rules to Live By", "Standard Terms and Definitions", and "Post Ranks". Look through the other stuff there, too, like "Age and the Forums".
On a more personal note, you are not alone. Many on this site have been through what you are going through. I live in the States and don't know the British system, so I would say to follow Jenny's advice. I think you want to talk over your feelings with someone neutral before trying to open up to your family.
But look around here. There are threads on coming out. And there are many here who will be happy to answer your questions.
For me the beginning stages were the most difficult – coming to terms with who and what I am, figuring out what I wanted and needed to do, and then coming out to my friends and family. There are plenty of bumps later, but I think those were the hardest.
Good luck, Vrony. Happy exploring.

- Kat