Hairloss

Im 15 years old and everyday a hand full of my hair falls out. I barely touch it and it just falls out. Its becoming very thin and I am starting to have a bald spot. I find my hair EVERYWHERE. Its all over my floor, bed and clothes. My mom says its normal and said to wait a few weeks to go to the doctor. This has been happening for a few months now and it makes me very upset. Please help, I don’t know what to do.