Stainless steel pans are not non-stick unless they have been coated with PTFE or another non-stick coating. But since non-stick coatings typically all come with health and safety and/or numerous environmental concerns, non-stick is not something we should be looking for in our cookware.  Though food can sometimes get stuck when cooking in stainless steel, the good news is that with a little adjustment to your cooking methods, you should not find this much of a problem.