Telling family that I'm atheist?

I'm 16 now, but since I was 8 or 9 I've always had agnostic thoughts & feelings. I've now accepted that I've been atheist for the past 4 years. I grew up in a Protestant Christian fmaily all my life(been baptised, used to go to chuech when I was small and everything) and I can't anitcipate how my family wil react. What can I do?