I've successfully explained aspects of being autistic to people who aren't.
One good way to do it is to come up with analogies.
Another way that seems to really work well, is to come up with an example they really understand, from their own life, but then explain that for you it's like that all the time in situations where it wouldn't be like that for them, or that it's like that even more intensely for you, etc. (Make sure they're really NT before using that one, and that they don't have some condition that makes their life much more like yours.)
Other times it's just not necessary to explain.
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams