I see many have already helped you however I'll still add my two cents in short.
I was pretty much in the same boat as you. I found no evidence and left islam and god all together when I was 14 but started thinking about it and researching it at 12 so I know how it can be, if anything is bothering you, talk to me. It's good that you're in America, being an atheist there is much safer compared to a middle eastern country and you'll probably stumble upon other atheists which can be a fun experience.
Keep in mind that in islam Allah himself said it's only up to him to judge, not your parents and that will be relevant to them. Important to know is according to islam there are no families in jannah (heaven). But I don't know if the last part is good to tell them
Tell them that the only reason you were a muslim from the beginning was because of your parents not because you thought for yourself, and now that you've thoroughly thought about it you've decided that you don't believe in a god.
Be careful with friends, there are some dumb nuts that can't think for themselves and don't respect other people, from what I've seen that strongly correlates with failure so let life take care of them. But don't avoid people because of their religion, there are plenty of awesome muslims, christians and jews etc as there are atheists.
Anyway, it is quite damn awesome of you to leave islam and think for yourself, based on my experience skeptical people, especially at a young age like yours that question everything are usually the logical and intelligent ones.
Also if you stumble upon some islamic sites, people or videos talking about how there is evidence for islam and you're mildly convinced, you come to me, remember that.
Goodluck, hope everything goes well.
I was pretty much in the same boat as you. I found no evidence and left islam and god all together when I was 14 but started thinking about it and researching it at 12 so I know how it can be, if anything is bothering you, talk to me. It's good that you're in America, being an atheist there is much safer compared to a middle eastern country and you'll probably stumble upon other atheists which can be a fun experience.
Keep in mind that in islam Allah himself said it's only up to him to judge, not your parents and that will be relevant to them. Important to know is according to islam there are no families in jannah (heaven). But I don't know if the last part is good to tell them

Tell them that the only reason you were a muslim from the beginning was because of your parents not because you thought for yourself, and now that you've thoroughly thought about it you've decided that you don't believe in a god.
Be careful with friends, there are some dumb nuts that can't think for themselves and don't respect other people, from what I've seen that strongly correlates with failure so let life take care of them. But don't avoid people because of their religion, there are plenty of awesome muslims, christians and jews etc as there are atheists.
Anyway, it is quite damn awesome of you to leave islam and think for yourself, based on my experience skeptical people, especially at a young age like yours that question everything are usually the logical and intelligent ones.
Also if you stumble upon some islamic sites, people or videos talking about how there is evidence for islam and you're mildly convinced, you come to me, remember that.
Goodluck, hope everything goes well.