It's a sad fact of life that if people find out something they can use against you, they just might. You're going to need to see a doctor anyway. Nobody here, except those members who happen to be doctors, has the qualifications to diagnose you, and even the ones who are qualified can't do so online. You will have to be seen face to face. If anybody is incompetent and unprofessional enough to laugh at you, go to someone else. You have a right to be taken seriously.

I do understand about the parents in denial, but you are of legal age and can get help without their approval--unless you have been adjudicated incompetent and placed in their guardianship, in which case they are obligated to provide you with medical care, and you can call adult protective services if they don't.