Tell him that Catholic school is where they sell the hard drugs and there's a lot of promiscuity (the rich kids tend to go there, so they have money and disinterested parents). It would be WORSE than public school.
Your dad probably cares about you a lot, but doesn't really know how to show it other than being nosy. I think that you should sit him down and talk to him in a mature and open way about your feelings and help set some boundaries and "give and take" about your responsibility and openness with him.
Tell him that you would like to be able to vent and write out your thoughts in your journal privately, because it helps you feel better about things that make you upset, but that you will "check in" with him every day at some specific time (like dinner together or whatnot) and talk to him about your day, and he can share his day with you.
Instead of having him always at your back breathing down your neck, give him clear expectations of what you are doing.
Tell him where you are going, who you are with, and when you'll be back. Always follow through with your promises, and be open with him.
You want him to trust you and to gain trust, you must prove yourself
My parents were ridiculously overprotective (they didn't even let me watch PG movies until I was a teen), and even THEY trusted me to go out for hours bike riding or doing errands on my bike or even going to co-ed sleepovers (and this was before cellphones were readily available).
They trusted me, and I earned that trust by following through with my actions and being honest and open with them about the most important things.
I think that your dad is scared that you're growing up and hes' not sure how to handle it, so he's going overboard in the protectiveness department because he thinks that he doesn't want you to get hurt.
But everyone makes mistakes and if you never learn to regulate yourself you'll just get into tons of problems after you turn 18 (believe me, I know too many people who totally screw up because they were so sheltered).
So, what I'm saying is be open and honest with him. Talk to him like an adult and let him know that you expect to prove your worth by your actions. If you follow through with your promises, he should be able to develop the trust to know that you can take control of your own actions and that you know the right choices to make.
Of course, if you just want to complain and tell him that you should be allowed to "do whatever you want" then you should probably grow up a bit more before you decide to revisit your dad's protectiveness.
Being able to "do whatever you want" without any rules or guidelines to help you develop responsible adult behavior is a fast track to lots of bad crap like teen pregnancy, gang activity, and dropping out of school and living on the streets.'
Do you really want all that?