Missing my Period

I'm 15 & I got my period a month before I turned 13 which was 2 years & a month ago. I've always had irregular periods and I asked my doctor about it (I didn't hit 2 years yet at the time). She told me that it was normal because the first 2 years are irregular. Well it's been 2 years and a month & they're still very irregular. I'm a virgin so I'm not pregnant 😊