Venecia is right. I went through all that too when I was younger. I mean I felt a bit like that when I started drinking in bars alone, it wasn't the main thing but surrounded by other people and still never feeling as lonely.
The good news is I am the complete opposite now. I am totes comfortable with myself, in fact I can't imagine it any other way and its other people all up in my headspace that might drive me to drink. So you can be too.