St Mirren start pre-season a week on Thursday, and the striker says he is keen to get going.
The former Newcastle player signed a pre-contract for Saints in March. But despite training with the Paisley side for the remainder of the season and featuring in bounce games, he was not able to play due to red tape.
Guy said: "It was very frustrating to have signed for the club in March but be unable to play in any competitive games.
"To be training all week and playing in bounce games and then when the weekend came to have to head back down south was frustrating.
"It was probably the most frustrating period of my career.
"Now I am looking forward to pre-season and doing everything I can to try and get in the starting side for the beginning of the campaign."
Guy started his career at Newcastle where he made one appearance for the Magpies in a Uefa Cup game with Sporting Lisbon in 2004.
After a loan spell with Doncaster Rovers, he made the permanent move to the Yorkshire side in 2005 and spent five years with the club, playing 187 times and scoring 24 goals.
He also spent time on loan with Hartlepool and Oldham Athletic, before moving to MK Dons in May 2010.
Guy then headed on loan to Oxford United earlier in the 2011/12 season.
His career record stands at 32 goals in 255 appearances.
Guy had been training with Conference North side Workington Reds when plucked by Paisley gaffer Danny Lennon.
He said he owed his move to Paisley to assistant boss Tommy Craig.
He said: "Tommy coached me at Newcastle and is the main reason behind my move here."
Meanwhile the 10000Hours Group hoping to take St Mirren into fan ownership will hold a meeting tonight having reached their target on Friday.
The Group had set a Friday midnight deadline to reach its target of 750 pledges of £10 per month.
Group spokesperson Richard Atkinson said: "It's still gaining momentum, so that's another good reason to leave it open."
10000Hours started its online scheme after reaching an agreement in principle with the selling consortium, led by chairman Stewart Gilmour, to buy a 52% shareholding for a total purchase price of £1.5m over three years.
Atkinson said: "We've had support of the board for the past two years in trying to get this to happen and we're just bringing it to a conclusion now."