Do what you love best, which is sing. Who cares if no one buys the record besides your die hard fans. That's the spirit! Do what you love most. Sing! That's more important than sales or publicity.
If my first album sold 10 copies, I wouldn't care. I love singing and that's what I will do. If people don't want to listen to it, then F them.
Your passion for your music is big. I'm sure you'll take it places. Who cares if you aren't on the same status has Britney Spears.