When I first started riding I bought an old Raleigh road frame. It was a low end steel. After IO decided that I was addicted I bought a better bike and took the Raleigh to the refinery. It stayed there day and night for 7 years until I retired. The frame had some surface rust, but otherwise was sound.
Ride your bike and don't worry about it.
If you get a new steel frame and fork treat the insides with a sealer and ride it.