The last thing you want to do is lower tire pressure unless you enjoy fixing flats.
I would get the fattest tire possible, get good at avoiding road hazards and always be ready to get out of the saddle. Your bike can put up with a lot of abuse if it doesn't have a few hundred pounds of rider pushing down on it, unsuspended. Your knees have way more travel than that skinny tire. Put them to work.
A pair of gloves with good palm padding wouldn't hurt either.