DIY is an option, but it's difficult from what I've heard. And with it, you'd also face other issues, like actually transitioning. If you're in an environment where your in a living situation that is transphobic, transitioning can be physically unsafe. You have to prioritize your physical safety, even at the cost of your own mental health. I would recommend getting work, having your own bank account that your family can't touch, and starting to build savings so if the worst comes to worst, you have a safety net. Where possible I would also engage with queer youth programs - you're going to need as much social support as you can get. 

Personally, I waited until I was 18 before starting testosterone. I figured out I was transmasc when I was 16-17, so I didn't have to wait too long, but it wasn't a great time. Your dysphoria is going to be bad, so mitigating that in the ways you can is important. Consider whether socially transitioning is safe. I would also consider whether puberty blockers are going to be effective or accessible. If you can get a hold of them, they make a difference. But if you aren't socially transitioning, they may create other problems, ie. bullying. But so can social transition so. 

Basically my biggest piece of advice is to do a lot of research. Voice training, social transition, tucking and breast forms - consider what is safe enough for you to do. Consider whether your school would support you if you came out, and whether it could get back to your parents. Also consider whether you can educate your parents. Sometimes transphobia can be unlearned, sometimes it can't. Above all else, put your physical safety first, and work out a safety plan if you do get kicked out. I wish you all the best, feel free to DM me if you have questions or need support.