It's actually pretty hard and rare...The percentage of firms to achieve sales of $100 million or more has remained pretty much the same since 1980, at 0.04% (that's 4 hundredths of one percent). (Of course that is counting all businesses that start up, which some posters say you can't do...?)
According to IRS stats from 2013, out of 5,887,804 corporations only 18,504 had receipts over $100 million (0.3%).
But I believe in you!