Which would you think is a harder choice? Becoming an atheist as a kid/teen or becoming one as an adult? [Spirituality & Religion]

I decided to stop believing in God at an early age. Probably about 10 or younger. Problem is that my impending doom totally freaked me out as a kid. Thinking about how I would no longer exist at a certain point in the future.

I've come to terms with it now. I was just wondering about people that became atheist later on in life. How did it make you feel?