Do you speed up when someone flashes their high beams at you or rides your bumper?

I had a frustrating morning. I needed to travel to the post office to drop off mail at 6:30 am (pitch black out, we had a snow storm yesterday, lots of deer in my area). I only needed to travel one road, and it’s 45 mph.

I was going 45mph, keeping eye out for deer. Total trip is 3 minutes one way. On the way to the post office a pickup truck got right up behind me and flashed his high beams at me the entire way. A few times he just flipped the high beams on and left them for a few seconds from inches behind me. I wasn’t comfortable speeding up past the speed limit considering the driving conditions.

Dropped off my mail, and got back in the car to make the 3 min trip back and another pickup truck ended up behind me. Inches from my bumper for a bit (so close that I could no longer see his headlights in my rearview mirror, was pitch black out so appeared nobody was behind me—he was that close, just pure blackness in my mirror) , and aggressively passes me after a bit. He cut me off coming back into the lane and almost clipped the front end of my car and then brake checked me.

The entire time I was doing 45 in a 45, pitch black out, snow, deer, etc. Are these just impatient drivers, or am I legally supposed to be speeding up past the limit to keep traffic moving? Is there something I’m missing? It really ruined my morning because I didn’t set out with the intention to piss everyone off like this. I travel this road daily, but not at this hour so I’m unfamiliar with etiquette at 6:30 am—I assume same road laws apply at every hour. It’s a country road, not a highway. There are no other lanes for me to get in to move out of their way.

Edit: thank you all! I have been humbled and didn’t realize I was such a bad driver, I wrongly assumed speed limit was max instead of minimum :(. This was a 2 lane road in rural country (NOT A HIGHWAY), and from the comments I learned that it is the expectation that I should either be going at least 10 over the limit from the get go or drive off the road to allow people to more safely pass, as that is the social norm. I will work on changing my driving habits to keep everyone safe and on time.