Its not easy living alone if you are a social sort of person, I did it for a couple of years, the first year I filled my flat with friends and music and ended up being evicted due to noise and what not, the second year I rid myself of my friends and lived in basic solitude and that was hard.
I think you just have to keep yourself occupied, involve yourself in your work and get lots of hobbies, I wouldn't recommend just inviteing anyone over because people tend to take the micky if they think your house is always open,but try to make friends (I know, easier said than done) with people outside.
If you are a bit shy or have difficulties meeting people then just chat to people online, they may not be in the same room as you but atleast its company.
Wish I could be more help.
Good luck!