It's only normal for young and unformed minds like yours to go through a phase like that. We all have our doubts, that's completely normal!!! As long as in the end you realize that deep down in your heart you know that there is no God, all is well.
The fool hath said in his heart, There is a God. They are corrupt, they have done abominable works, there is none that doeth good.
Psalm 14, KJV revised edition