Adhd diagnosis Psych uk

I have my appointment soon and my imposter syndrome is kicking in hard. Im with Psychiatry UK and just wondering what the meeting will be like. What if this whole time iv just been making this all up and in taking away someone else's chance for diagnosis. It was a struggle to even get this appointment and took me a good 8 years to even accept the idea of seeking professional help. What if the person just thinks oh look another one trying to jump on the trend. Idk I feel like im just writing things for the sake of it now. But anyone with experiences of psych uk assessment could you let me know what happens either in the comments or DMs. Thank you.