I also generally don't dream, or at least exceedingly rarely do I dream.
I know other people who dream will have like full on stories. A handful of times a year maybe when I can actually recall something its usually blurry flashes or a vague sense of a scenario and that's all I can recall.
When I was a child I used to dream every single night, and then one day it just stopped. My current lack of ability to dream kind of bothers me because I feel like it will be kind of cool to slip into a fantasy world every night. On the bright side it's probably been decades since I've had a nightmare so at least there's that.
A lot of other are saying in this thread if you don't dream it's due to THC consumption, but I don't take any form of THC so that's not really the issue for me.