My mom is in complete denial about my autism

Well. I just got diagnosed with autism and anxiety. I only told my mom about the anxiety part and...my mom said, "haha yea cause autism or adhd you CERTAINLY don't have". Am I awful if I never tell her about my autism? if I never let my family know this? Nothing will change by me saying I have autism around them. I am still me. My family may not understand and I'd rather not deal with my mom asking "why" or completely denying it, telling me they're wrong..Even tho my assessor said a lot of the things my mom said about my childhood and me as a person fits autism criteria. My mom just has a stereotypical view of autism. And I can't change that.