I wouldn't find it a surprise that you found it offensive, many delusional people get offended easily, like me. I'm diagnosed with paranoia and anti-social personality disorder and have other issues and I know what it is like to face the things you must live with.

If that is the case, go on a resourceful mental health website, print out the page that reaches your certain criteria of how you feel and what signs and symptoms you may have and show it to your parents. Your parents should have the decency to take you to the doctor to get a checkup.

Don't rush into concerns just yet, before we start having concerns for disorders, make sure it is true and to get it checked out. It could be anything, it can be a delusional disorder, anxiety disorder or schizophrenia.

After being informed that your upcoming years are very crucial and important, it is absolutely essential to get all of this evaluated as you don't want any disturbances psychologically which can greatly affect your performance.

If your parents still bring up the "it's just a phase" or "you'll grow out of it", inform them how it can be genetic and some are incurable but are highly treatable through medications and therapy.