I'm wondering then if it would help if you got yourself an autism assessment? You could try asking your GP to refer you to your local NHS team - although the waiting list's likely to be years rather than months. Alternatively, there are some reputable private practices that carry out assessments with people of your age: you'd be looking at c.£500 for a thorough assessment.
It may be that it wouldn't be so much the confirmation of autism that would be helpful for you (bearing in mind, of course, that the assessors may disagree with you that you are in fact autistic!), rather than a detailed examination of your strengths and challenges in terms of how you may differ from most neurotypical people, together with suggested strategies for managing the difficulties of being autistic in a world that's designed primarily for neurotypicals.