@FunnyFelipa College or high school? Your 17 and a Freshman in college, is that right? I would research colleges to transfer to that have good deeds in the major you are interested in. If you keep your atheism a secret from your parents you can find a school that has a strong religious group on campus to convince your parents. A friend of mine is an ordained Baptis minister, and he always tells kids to apply to good schools with a Christian presence, rather than a Christian college. He knows many Christian colleges are not held in high esteem around the country for some majors and he thinks it puts the student at a disadvantage unless it is Notre Dame or Boston College, which are Catholic colleges, not “Christian” colleges. If you live in the bible belt people might know the college and be ok with it, but move out of the bible belt and maybe not.
Do you have to take a religion class in college? How does that work? I know in K-12 there might be a prayer at the beginning of the day and then religious class one day a week, and religious language used by some faculty, but in a Christian college what is it like?
I see nothing wrong in keeping your atheism to yourself. I’m an atheist and lived in the bible belt and pretty much I didn’t mention to people I was an atheist. If they asked what church I went to, I said I don’t go to church, or that I was not very religious. If they asked my religion I told them I was Jewish and let them assume I believed in God without correcting. Most theists assume other people believe in God, let them assume. Also, the Christians I know who do know I am an atheist are fine with it, because we are all adults, but when I was younger a couple of my holier roller friends were judgemental about it and said some offputting things.