yes I only own EF-s lens. Do you know of any film SLRs that are good enough?
If you put an EF-S lens on a 35mm film body you will get vignetting ( shadows ) in the corners because the APS-C sensor size that the image is designed to project onto is smaller than a 35mm film frame.
Are you sure you have EF-S lenses and not just EF lenses ? If you have any EF lenses then look for one of the old EOS film cameras. EF are designed for full frame digital cameras so almost the same size as 35mm.
I have an old Canon A-1 with some FD lenses back in the UK and will be bringing it over here later in August with a view to selling. It is a superb camera with manual, Av, Tv and fully auto modes. Also self-timer, multi-frame exposure, stop-down metering etc. PM me if interested in buying, I am not expecting a huge amount, just enough to offset the purchase of some macro equipment.