irregular periods🤕

I’ve had irregular periods since 2017 and I dont know what to do. I know birth control can help but when I brought it up to my mom she immediately refused me to have it and didn’t believe I wanted it for periods. I’m 18 years old now, still living at home because of school and it bothers me. I am currently 33 days late. (definitely not pregnant tho) Please comment suggestions of ANYTHING.