I’ve noticed that because of current understanding and research for adults are minimized due to people’s naturally tendency to develop coping mechanisms as they get older. So by saying you showed signs as a child they may take the time and actually listen to what you have to say. Definitely don’t lie but insist that you showed some signs as a child, and talk about issues you have today and steer them away from asking about details you had as a kid. I’d bet you did have some signs as a kid but you can’t remember/people didn’t notice. Remember a lot of these symptoms are related and could easily just be due to anxiety or well anxiety idk.

For me personally I was tested as a kid but had my medical record essentially wiped and my parents didn’t want me in any “special” classes. The schools I went to definitely had no handle on how to treat basically any neurodivergence other than stick everybody in the same class.

Another way is too force a recommendation from your doctor to a testing facility, psychiatrist, or therapist. And hopefully they’ll listen to you and get a good diagnosis. It probably won’t be covered by insurance and I’ve seen prices range from $500 to $2000 so make sure to ask. Some testing facilities technically brake the law by not informing you that’s it’s not covered under insurance, so make sure you get in writing that your exact insurance is covered. Not just x company accepts it but your exact insurance plan.