I think I might be autistic
What makes you suspect that you are autistic?
I get extremely confused over straightforward conversations.
I see, and that may be a telltale symptom for autism. But you can't self-diagnose, because you are trivializing others who do have autism by claiming to be one of them based on a stereotype. You need to get a checkup to make sure before you can label yourself like that.
A checkup is probably a good idea. I still feel like I am intelligent however despite being possibly being autistic.
I can tell that you are pretty well-versed in the signs of a possible autism disorder, so I don't doubt that you are very gifted in many academic pursuits.  But the fact remains that you are not trained as a doctor, and even if you were, it would be impossible for you to examine yourself.  You need a professional's expertise on this issue.