How do I slow down?

I've noticed that I'm always rushing through every facet of life. I get food and wolf it down. I get on the highway and I'm faster than everyone else out there, and get upset if I can't go 80 despite having no set deadline for getting where I need to go. I'm in a hurry to get out the door and always rush my girlfriend to get ready so we can get going. I know this stresses her out so I've been trying to get better about it. However, this brought on a new question; why am I always in such a rush?

I was watching a video earlier about the way the world is becoming more and more artificial in the pursuit of maximizing efficiency. In the comments, someone was talking about how, in the past, we had time to slow down and enjoy things. The full comment read:

We had time back then. Nothing was a rush. We had time to think, time to talk, time to be with each other. The internet and the consumer society has sped everything up and it’s all now a rush to do everything? Time is flying by and it’s all bland due to the rush of production for everything to make money. No time to relax and ponder life or self

I'm among the middle of gen z so I hardly remember a time like that. Growing up in this manufactured world, I've noticed this reflected in myself as well. I'm one of the least patient people I know. Sure, it can be advantageous in some situations, however I feel like it would be nice to slow down and just enjoy life instead of rushing through everything.

How can I teach myself to slow down?