As a retired employee of the Florida Department of Education, I just want to remind you that lack of a high school diploma WILL hurt you, if you have any thought of getting a good career going down the road. Even a GED has little to offer here. You will be locked into low-grade minimum wage temp work. Stocking shelves at Wally's, slinging burgers, etc.
Serious employers look at your school graduation NOT for what you know, but for the fact that you stuck it out, and know how to apply yourself. They do NOT like GED, as that is seen professionally as 'the lazy way out', no matter how smart you are. Simple fact of the professional life. If you decide on joining the military (NOT for everyone, I know) they too will not take on someone without a HS Diploma.
At fifteen, you are enthusiastic, and think you have the world as your oyster. You will find all the 'good shells' tightly closed without that diploma.
One thing the GED is good for, is a stepping stone out of the rut of being unemployable. It allows you to attend Community College, which you can parlay into further education and eventually a good career. Going this route doesn't mean you give up the Van Life. You don't have to enter the grinding rat race of owning a fixed home you can't really afford, getting married and having your 2.5 kids, like the average American. You can still live in your van and have fun. Earn a scholarship, take part in other educational financial aid, you can go far. And still live your life on your terms. Choose the right line of work, the skies the limit, anywhere you care to go. Of course, burger flippers are needed everywhere too.......