GP Refusing Referral Due to Being a Student

Hey, I'm really at a loss at what to do. Every time I've been to the GP to try and and get a referal I get told that despite being "obvious Autistic" because I'm a University student and "obviosuly well adjsted" a diagnosis isn't needed and will just "hinder me" so I just get sent to counseling for social anxiety instead. I really don't know what to do. I know getting a diagnosis will help me massively at Uni and when it comes to finding a Job in the field I want to go into. I just don't know what to do to get the diagnossis I don't want to just keep going to the GP becaue it's really not helping anything.

Can anyone give me some advice?