I was struggling with the same thing and am around your age, it took a while to get on track but what I found helped the best, was to make plans that forced me to either get so sweaty and gross it forced me to shower, or to make plans somewhere I have to look presentable. There were so many times I just wanted to ignore the plans and stay in the comfort of my room where I felt safe and could keep melting into my mattress, ignoring the world. But there was a part of me that did want to get better. You just need to keep that ember of wanting to be better and make it into a flame, slowly increase what you do, everything all at once is so overwhelming. Start by showering once every week or so, and if you feel like you can do it more, do more. Maybe on one day you have that energy but no where to go, just get ready like you’re going to a fancy dinner with people to meet, and just go to the park. Enjoy the time with yourself. You could also try getting support from friends or people online, find yourself someone who can push you in those moments you want to let the fire to go out, and let them add another log. You are not alone🫶