My advice is to just keep playing.
You have zero friends and do not play multi-player games, so it is not the social aspect that brings you pleasure,
Does it matter if you shoot a 60 or 160?
Set yourself realistic goals and you will continue to enjoy.
Red tees you are cheating yourself, and it would surely become tedious and boring. The challenge keeps it interesting.
If you spent money on upgrading clubs, yes your scoring will improve, but not necessarily will you derive more enjoyment.
p.s. to the girl in the red tee....invite sent :))