How to tell my parents I don't believe in Santa anymore..?

Well, I'm 14 and I haven't believed in Santa Claus for a really long time. I have just never told them because I don't know how to tell them, and I don't know when a good time to tell them would be. I'm kind of close to my parents. They still think I believe in Santa, The easter bunny, ETC. Any ideas on how to tell them I don't believe anymore? We always have this tradition where I wake my parents up in the morning and they go downstairs and take a picture of what big gift "Santa" brought me and my brother (he is 23 so he has already been through this) And then my brother and his fiance comes over and we open presents that we got for each other. So I kind of don't want to break tradition, but I think that I really should tell them I don't believe anymore. Please help!