My mom doesn’t understand my anxiety

I am a really bad germaphobe and my anxiety has been increasing recently. I went to the gas station with my mom and i couldn’t physically touch the gas pump. I just couldn’t because i know how many germs is on it. My mom yelled at me and told me my behavior was sad and i was acting stupid and irrational. she doesn’t understand that i KNOW my phobia and my anxiety is irrational. but there nothing i can do about it. I don’t know what to do