Joined: Jan 2009
Posts: 44,135
Likes: 6,350
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
If all the bikes you ride lean to the same direction, perhaps your pelvis is tilted.
The best case scenario, as desconhecido said, is that the wheel isn't in straight.
Second is that the fork is bent to the side. If you have a bench vise and some patience, you can do this.
If one fork blade is bent back, it will be hard to straighten, and you might want to consider replacing the fork.