Too Afraid To Ask

POTENTIALLY DUMB QUESTION ALERT, but I'm here for a reason. I have SEVERE ADHD which a lot of the time feels like I'm bordering on autism when it comes to specific interactions. I've developed a habit of just, throwing out the phrase "oh, I'm just hella autistic" as a reason if I do something weird in a social interaction, like get overly passionate about something or get awkward or whatever.

I've never been formally diagnosed with autism, but I've had therapists suggest I may be autistic. Idk why I keep fucking saying that I'm "autistic" I feel like it's just easier to both say and explain as opposed to "oh I'm neurodivergent" or "Oh im just mentally ill :3" Its also cus I assume most people know what Autism looks like and thus I dont have to explain as much, as most people dont know what severe ADHD looks like and I assume most dont even take ADHD that seriously.

Is that something to just throw around like that?? 'Cause I have friends who actually are autistic, and after hyperfixating on all kinds of mental health research, I don't exactly fit the bar for autism, I'm wayyyyy too outgoing and sociable(?) among other things. My symptoms fit more under severe ADHD or potentially even AuADHD. Which I also have no idea how I can go about getting a diagnosis.