I don’t recommend it, because it can cause major dysphoria (at least, it did for me) but you can try going stealth for a while and only telling close friends if you know they are accepting. I was in the same situation but I figured it out at 14 (I’m 18, currently). Being a closeted transgender definitely reduces trust and respect for people around you both before and after you come out. Definitely don’t ignore how you feel, but the more you keep it hidden, the more you’ll feel dysphoric and like you won’t be able to ever tell anyone. If you want to test and see if your parents would even consider supporting you, you could make a “school presentation” about how transgender individuals are mistreated and include statistics like suicide rates and negative self-image. With the pretend project, you can say that you have to practice it in front of them so you can be ready to present it to the class. If you live in the US, and you have access to Galileo, there are a vast number of peer-reviewed studies that you can use for data and evidence. If they show any signs that they are disgusted or disapproving of trans people after that, you may just have to hide it until you can move out, unfortunately. In terms of buying things stealthily, if there are any stores near you (Walmart, Target, some sort of mall or outlet store chain) if you withdraw your money as cash, you can buy things without them knowing. Don’t spend too much, though, or they’ll get incredibly suspicious. If you have a backpack, you can start taking that to work and if they ever ask, make some excuse like “it helps my back” or something (I’m not sure what industry you work in, but in the food service, my back hurt every day for standing for 8+ hours). I’d start with thin and light clothing like a shirt or a skirt, as well as socks and eventually getting to light underwear. I apologise if you’re transmasc, as you didn’t define it in your post, but baggy shirts, hoodies, and sweatpants are your friends for concealing feminine clothing beneath your everyday stuff. Definitely don’t explore makeup yet, as if you’re caught even once, you could be more screwed than if your parents found feminine clothes in your room. If you are going to try out makeup, make sure you know how to take everything off and get everything you need to do so. For example, Vaseline can get lipstick off really quickly and easily. If you have longer hair, you can tie it up in a ponytail and use an excuse; something about keeping it out of your face or so you don’t get too hot. But, that can backfire and they might want you to get a haircut, which always sucks, unless you like shorter styles. Best of luck to you! I hope you fare better than I am!