Okay. Stop. For starters, most revolvers don't have safeties. You have what's called "cylinder lock". It's broken, but may be repairable.
Second. Posssession of a gun with "shaved" serial numbers is a felony with a mandatory sentance in federal prison.
Third. How would you use a gun for self defense if you don't put any ammo in it? Do you think guns are just for scaring people?
What kind of gun is it? Can you open the cylinder as if to load it?
Yes the chance that it is stolen is very high. If you take it to a gun smith he will probably run it thru the NICS gun check system.
Google the make and model of gun and you should find lots of websites on how to clean and repair it. Don't attempt any modifications. Just fix it. It may just need a good cleaning and oil.