The six-time Grand Prix winner was left driveless at the end of the season when he lost his Toyota Formula One seat to German countryman Timo Glock - the GP2 Series champion.
But, despite having seemingly been frozen out of the frame by leading teams in the DTM, WTCC and A1 GP series', he is still confident of racing this year.
"Motoring was, until now, my life and will certainly remain a large part of my future," Schumacher told Motorsport Total.
Audi name 2008 DTM line-up
30/11/2007 AT 16:28
"In what form, that remains to be seen. I have neither any offers or any concrete presentations, but that is okay as I am glad to have some peace and quiet for a while."
Schumacher, 32, who suffered two huge crashes over the United States Grand Prix weekends in 2004 and 2005 - the latter putting him out of action for four months with the resultant injury - said that he would not risk putting his life on the line in any class of racing that was less safe than Formula One.
"I must say very honestly that I experienced beautiful years in F1, but also had many accidents," he added.
"Whatever I do in motoring, whatever class that will be, still has to be one with comparable safety to F1. Anything else is not conceivable. I will not [race on] an oval, for well-known reasons, and I will also never do Le Mans or the Rallye Dakar."
Schumacher was rumoured to have been told by his brother Michael - a seven-time world champion - to take a sabbatical year from Formula One before attempting to return in 2009.
He refuted this though, and said that he believes his Grand Prix career is now over after 180 starts between 1997 and 2007.
"We did not speak about that," he added. "I have not spoken to Michael since Jerez. Theoretically, we must wait and see what is possible, but F1 waits for nothing and no-one."
Season 2008
Mercedes keen on Ralf
17/01/2008 AT 14:24
Season 2008
Schumacher nets DTM test
15/01/2008 AT 12:51