Welcome.
Don't do anything just yet. You have plenty of time. For now, just read many posts on here and give yourself time to think.
Yes, I agree with posters that education is the most important thing. Don't do anything to jeopardize yours. If mom will pay for your college, then right now, you don't have to tell anyone anything.
I certainly do advise that if you are not baptized, don't take this step. Many people are not shunned if they are never baptized.
Please remember....you have plenty of time. Don't rush into anything. There are always repercussions to decisions.We wish you the best.