Michael Eavis founded the festival on his farmland in 1970
Michael Eavis said he nearly gave up organising the Glastonbury Festival after last year's wash-out.
In 2007, the cost of clearing up 30,000 tents and 180,000 tent pegs was £800k.
"Last year I thought I genuinely can't do this anymore. All the tents were left behind and the site was a mess," he said.
Mr Eavis said he "soon got over that" and would now like to continue organising the festival until he is 80 years old - another seven years.
"It's a schoolboy's dream come true this is," he said.
"When it works like this, we've got the best, fantastic show."
'Changing the style'
This year is set to be the first time in 15 years the event has not sold out in advance.
Mr Eavis told BBC Somerset he believed three years of mud had taken its toll and that some people may have thought the festival was "getting too big for its boots".
He also defended the controversial decision to have US rapper Jay-Z as a headline act, saying it was boring to stick with rock bands.
He said it was important to make changes from time to time but admitted they had "stuck their necks out on this one".
"We're changing the style of the event all the time. We're improving it and looking for the next best thing all the time," he said.
Mr Eavis added that there would still be a Glastonbury Festival in the next 10 years, but probably not in 20.