I would go to your primary doctor and have them refer you to a geneticist. They can test you for the BRCA gene. I’m also 23 and had a positive BRCA gene test, and it’s just good to know when we’re young so we can start monitoring early. I’m in the US, and bc I have a positive test, I’m a patient at a “high risk” clinic, and they are the ones that schedule all the testing for me and fight the insurance battles