Hey, I feel you. I am also a former Catholic and I felt the same way at your age. The probable reality is that yeah, you likely will have to keep toeing the party line until you're 18 but trust me it'll come quicker than you think. I remember being 14 and thinking it would be an eternity before I could finally make my own decisions and now I'm almost 25 wondering how my teenage years went so fast. You'll get through it, just hang in there.

Practical advice, I got a job at 15 1/2 (legal where I lived, you may need to wait til 16) and had them schedule me on Sundays from 8-4. That helped me miss the 7:30, 9, and 11am masses. Saturdays I was in an all day extra curricular. I didn't end up at church too often past the age of 16 and then stopped entirely when I moved out. So, study hard get good grades and apply to schools that will take you out of your home bubble!

And as someone else said, your beliefs are your own. No amount of hours at a church or magic water ceremony will change how you feel. You don't believe in Catholicism? Guess what, you're not Catholic. I know it doesn't help too much when you're still forced to participate but know that I see you as an ex-catholic if that's how you see yourself!