Hi Lone Wolf and welcome to the Cartographers' Guild! When i started playing rpgs, we've been only two guys and these sessions have been a lot of fun back then. We didn't play with premade scenarios though. Many rpg scenarios are written for a group of ~ 3-5 players, but a lot of them can be reworked for only one player (and the GM ofc) i think.
I also would recommend to have a look at the many websites where you can play rpgs with other people online. I think https://roll20.net/ is a rather popular one but there are others too. I have never played online but there are many in a similar situation like you who play this way.
Maybe some people here have more experience with this sort of software and can give you some hints.