I still feel like a bit of an imposter when seeking help, as I am very high functioning, and can pass as quite intelligent in most settings, and working at a job where I often encounter low functioning and even non verbal poung people, its hard to feel like I deserve to ask for help in the first place.
I feel this. I was also diagnosed as an adult and I also pass well. The first time telling my friends about my then-new diagnosis was met with the reaction "what, no you're not!" and I'm still mentally affected by that conversation. Dealing with guilt and imposter syndrome type feelings is tough. I don't really have any advice but I know how you feel, at least.