United Kingdom, March 7 -- Lady Gaga fears feeling alone.

The 38-year-old pop star is one of the best-selling artists of all time, but Gaga has admitted that she felt isolated in the early years of her music career.

The 'Alejandro' hitmaker - who is engaged to tech entrepreneur Michael Polansky - told the BBC: "I think my biggest fear was doing this by myself - doing life on my own. And I think that the greatest gift has been meeting my partner, Michael, and being in the mayhem with him."

In recent years, Gaga has realised that she doesn't need to have a "dividing line" between her personal and professional lives.

The chart-topping singer - who released her debut album, 'The Fame', back in 2008 - explained: "I think what I actually re...