Hi Sparksz,
Congratulations on 5 days
At first when you quit alcohol it leaves a big hole because much of your social life would have revolved around drinking the stuff
Once your friends realise that you are serious about not drinking i'm sure they will accept it and will continue to see you - just not in the pub or bar.
The other thing is that If you stay sober maybe your ex girlfriend will have a change of heart, she was obviously one person that you could have done non drink based activities.
If you work at it you will be able to fill the void