I have a appointment for Meps but I feel like the military isn't for me what can I do

For context, I've been talking to a marine recruiter for a few days, originally I told her I wanted to wait a while to get my stuff together and feel like I'm ready for the military. But she talked me out of it and now I have Meps In a week.

My main reason I think it's not for me is because I have a feeling I could be on the autism spectrum and my mental health is absolutely fucked.

I can't stop thinking about what's can go wrong. I truly think I messed up.

But I still want to be in the Marines. Just not right now. I want to think about it for months like most do to see if truly is for me.

Should I cancel the cancel the appointment it's in a week. Im also a heavy stoner and I can't blame nothing but stupidity for putting me in this position.

Roast my ass, give me good advice idc just give it to me straight