'I don't feel comfortable on a golf course,' said Montgomerie, who announced the break-up of his marriage last month. 'I don't feel comfortable anywhere.'
After failing to finish in the top five Sunday at the Volvo PGA Championship, the Scot dropped outside the world's top-ranked 50 players. Ranked 57th, he no longer qualifies automatically for the U.S. Open and the British Open next month.
Montgomerie said he would play in the U.S. Open if he were given a special invitation. He has played the last 12 U.S. Opens and finished second in 1997 and tied for second in 1994.
The U.S. Open is June 17-20 at Shinnecock Hills Golf Club in Southampton, N.Y.
Montgomerie was expected to attempt to qualify for the British Open, which will be played on his home course, Royal Troon, near Ayr, Scotland.
'Unfortunately, the timing of the whole thing was wrong for the U.S. Open, the British Open,' he added. 'It doesn't matter. I've played enough of them in my day. We'll get back into this one day, but not yet.'
Montgomerie won the European money title seven straight times in the 1990s, but has failed to win a major. In addition to coming close to winning in the U.S. Open, he also finished second in the PGA Championship in 1995.
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