I’m 20 years old and my period is always one week or more late when it comes. Is this normal has anyone else had this experience?

I’m in the Uk And the doctors are awful lol I did an ultrasound scan way over a month ago, blood tests, etc STILL waiting for updates and results

Very stressful for me I’m so worried and the doctors just don’t care

I’m so scared like I’m really scared if there’s something seriously wrong