I just don’t understand why I’m always sick

I’m 22 and have been chronically I’ll since about 12. I Have 3 autoimmune conditions, migraines and survived cancer. I eat healthier than anyone I know, take care of my body, try my best to avoid toxins, don’t drink/smoke, don’t eat out(no junk food), go to therapy to help me emotionally, do inward work. I’ve tried many western and eastern methods of medicine, I’m spiritual and Christian. I do most of these things because I just like to take care of my body but I’m just not understanding of why it’s falling apart. Idk if anyone has experience with this or has suggestions?