United Kingdom, June 17 -- Garth Brooks has revealed how he's spent the millions of dollars he's made from his music career.

The 64-year-old country superstar has an estimated net worth of around $400 million after spending more than 40 years in the music industry and he's now explained he's put his money to good use by making sure his parents were taken care of and buying land for his daughters so they can ride horses.

He told The Times newspaper: "Money is the greatest gift because it allows you to make someone else happy. I can buy land so my girls can ride their horses. I can make sure their mother gets everything she wishes for. My first hit album took care of my mom and dad."

However, Garth admitted he is plagued by doubts as he ...