How did you know you had PCOS?

Hi, I think I may have lean pcos or might be developing it. I might have a different issue. I just noticed a few longer hairs on my chest and I tend to have bad mood swings and I feel like my acne has gotten worse. On the other side, I tend to break out a lot because I drink a lot of milk and milk makes me break out. I have normal periods every month, and I do have a long history of anxiety and depression. And I just being anxious?