"The irony is that I have been performing pretty well over the past few months," said Bulloch, "but the truth is that I have not been enjoying my rugby as much as I should have been.
"Since Christmas, I have been thinking about laying foundations for my future and I have been handed certain business opportunities which are too good to ignore."
Alan also claims he never felt he suffered from being in the shadow of brother Gordon, who has Scotland's most-capped hooker.
He said: "I have never had an inferiority complex in that respect. No one has been more chuffed about Gordon's success than I.
"He has been a fantastic team-mate at West Of Scotland, Glasgow and Scotland - but above all else, he has been a great friend and inspiration to me in the sport."
Alan will take up his job as account manager for Startrite in Scotland and the north of England almost immediately. It also looks likely he will continue to play on the club scene, probably with GHA.
"I had hoped to be involved in Glasgow’s match this weekend against Leinster in Dublin, but coach Hugh Campbell told me he had decided to leave me out because he needs to prepare for the future," said Alan.
"His approach was understandable and I will be available to him for the rest of the season if he needs me.
"In the meantime, I may be involved in GHA's important delayed Premiership match against Boroughmuir instead.
"People have asked me if I will get into the coaching scene. It is difficult to say at the moment because I have to focus all my attention on my new career."