I had a bit of a defiant streak as a youth and did what I wanted to do anyway. You shouldn't necessarily follow my path. If you got to ride, you will figure out a way. The streets maybe extremely dangerous between your home and school so your parents may have a good point. I rarely ride on roads with a higher speed limit for good reason...safety. An expert cyclist was just run over and killed from this forum just a couple of months ago while doing all the right things...even on a dedicated bicycle path adjacent to a road...that I and others still haven't gotten over. The roads are extremely dangerous. If you must ride...still see if you can get a nice road bike and convince your parents you will walk the bike to a safe riding area like a local sub division with a 25mph speed limit. You don't have to ride to school. You don't want to leave a nice bike at school anyway..maybe a clunker but not your favorite bike.
You will figure out a way. As a sidebar...I was mechanically inclined when I was your age and built go karts and minibikes from scratch. I used to sneak my minibike which would do 50 mph out at night and terrorize local neighborhoods with my other buddies until one night we got caught by the cops (after successfully outrunning them to our secret hide out location on many previous nights) and I caught holy hell from my parents who were having their bridge club over the night the cops came to my front door. Funny in hindsight ...painful at the time as my Dad was a big guy if you know what I mean ...but still worth it.
George