Whether it's the club tournament, playing with the boss, or trying to look like you've got game to your foursome, you have probably got stuck with a case of the nerves. Even Jack Nicklaus, at the height of his playing career, was nervous on the first tee.
My advice: make it easy on yourself. Use a club you are completely comfortable with off the first tee. Your 3 wood, even one of your utility clubs. Maybe your ball won't go as far as you'd like but your foursome are going to say, "great shot" when your ball sails down the middle of the fairway.
On the first tee, go for the sure thing. It's a great confidence builder.