I am such a hypochondriac

I’m 21 years old and idk why I’m such a hypochondriac. I literally think I have breast cancer, skin cancer( from a new mole I have) and cervical cancer. I think I have a blood clot in my brain according to google when I have constant headaches. I cry all the time and spend so much time googling everything idk how to stop. Why am I this why and how can I fix this ?? Ugh