I myself am an atheist and i started thinking the way you are when i was about 12, and became an atheist when i was 13. All i can say is read up on some scientific points of view on the subject on religion instead of just reading religious points of view. If you only read about the religious side your just going to get one sided, biased points of view.
When i started losing my faith i was somewhat distraught but then i read about the big bang, evolution, and everything i could about space, and i found these explanations of our existence to be much more peaceful than any religious explanation. No worrying about choosing the right religion, or burning in hell for choosing the wrong one. And just think about this, no religion has any proof nor any evidence to support its claims, and i mean absolutly NONE. The theory of evolution and big bang theory have many experiments and observational data to back them, and an extremely large percentage of the scientific community as well. I suggest you look into these subjects since your thoughts are very similar to the ones i used to have.