I've been practicing for a few months now. 
I had a Christian upbringing. I grew up with just my mother, who wasn't very religious. However we always went to Church because a) it was a habit and b) for my grandmother. I HATED it. It was soooo boring, and the words never really meant anything to me. Then fourth grade. In my class there was this kid who parents were strict fundies. So I got into debates with him about religion and how dumb it was that his parents didn't let him do things that were "against God's law". Then guess what happened: paranoia struck. Recent shootings frightened the life out of me. I thought I was going to be murdered. I fell into depression. I hallucinated. So I turned to God. I prayed to him, which brought temporary relief, but even then I never really felt safe with him. I became a minor fundie. 
Was I an idiot then. Now one of my friends comments "you were super religious back then." Then one day in Fifth grade, I searched up "how to become a cat." Then I turned toward the Greek and Egyptian god/esses. Why? An experience from when I was seven, and one from fourth grade.
When I was seven, I started worshiping Apollo, and generally the Greek Gods. I read every book I could get my hands on on them. I researched. I could feel them around me. My personal favorites were Apollo and Athena. Strange, huh, for a seven year old to start worshiping something other than their religion. What can I say? They were meant for me.
Onto fourth grade. I started reading up on the Egyptian god/esses and such. Again, I read every book about them I could. I learned hieroglyphics. I started my own society. (Even though it was just a game-I LOVE fantasy games.) Well, guess what. The fundie's kid, we'll call him A, joined the game. When his parents found out, boy oh boy were they mad. He was banned from playing it.
Once I really got into Wicca, and all that, I decided that my main god/esses would be this: Apollo, Aphrodite, Athena and Bast (some people call her Bastet). However I stopped again because of peer pressure from my grandmother. Now I'm back on the path and glad!
