While I understand the desire to come clean about your atheism (and to sleep in on Sundays), you need to weigh that against what you think the likely consequences of coming out will be. If your family and circle of acquaintances are that conservative and devout in their beliefs, your announcing that you're an atheist might result in two years of well-meaning but unwelcome attempts to bring you back into the fold. That could be more aggravating than the status quo. Just a thought.
Once you are 18, you might be able to take ownership of your atheism without becoming everyone's project.
Once you are 18, you might be able to take ownership of your atheism without becoming everyone's project.