How do you know or ask if someone is a friend?

This is a bit complicated. As I’ve said previously, I’m autistic (asperger’s) and I have an impossible time making friends due to issues reading people and other stuff. The last time I made a new friend was when I was 14. I am 23, nearly 24 now.

The few friends I have are people I know from high school (we all live in the same area still) but as is probably true for everyone, those relationships are not what they were in high school.

The person I am closest to, I’m not sure if she really considers me anyone anymore. I want to flat out ask her, so I can move on. But I also don’t want to cause a situation where the person feels pressured to say yes.

I don’t know what to do. I’ve been having lots of dreams about times when I had friends and then I wake up and get all depressed about my extremely solitary life. So I think I really need to know the truth, for my own mental health.

But as I said, I’m not too sure how to go about it.