I feel like I am reading the male parallel to my own story. I too went to a modern orthodox co-ed elementary school. There were kids in my grade who weren’t remotely Shomer Shabbos. I then went to a way frummer, but still MO, all-girls highschool, and realized that I did not like the MO way of life. So I found a teacher to be my “mentor”, who I had discussions with, would go to for shabbos, etc. even in a MO school you probably have a few “yeshivish” teachers, find them and a make a Kesher.
and regarding the learning at the yeshiva: maybe see if theres someone there that has a car and is willing to meet with you closer to your house or pick you up? and remember that problem is only until you get your licence, at that point you can drive yourself to night seder (I have a brother who did that his last 2 years of highschool in exchange for agreeing to stay in the MO highschool through graduation and not leaving for yeshiva)
also, I would suggest slowly hinting this to your parents, not in an obnoxious or demanding way, just enough so they’re not shocked when you want to go to a more serious yeshiva after highschool.
regarding being mad about where they sent you/how they raised you. I was also mad for a number of years, but then I realized two huge benifits I got
1- because I saw so much of that side, i was able to say I didn’t want it and become who I am today
2- the fact that I did get such strong acadamics at a younger age means that school is easier for me, and when I was in college (under parental pressure) it did not take so much time to do the work, letting me spend more time how I wanted
so in short, my answer is, if you think the MO way of life is not for you, then don’t do that, no shame in going one step to the right 🙂
Hatzlacha!!!