I honestly cannot remember. I do remember the first time I hit 60mph I felt very vulnerable. Looking at the concrete whizzing by with only my limited skills keeping me upright was a bit nerve racking, but I first hit those speeds on a State Route where the traffic was light. I don’t remember the nerves lasting long though and by the time I hit the interstate it was no big deal and I could give my full attention to the traffic.
The back road to your friends place sounds like the perfect place to get acclimated to these speeds, but I would probably go just a little way there the first time out and then come back. Once you know you are okay with it then it should be an enjoyable trip for you.