Don't feel bad, it seems other members, including myself, can go over a year before finding even one silver.
I just found my first silver a short while back in a park in an area that was used as far back as the 1700's. It was roughly about 8 - 10 inches deep if I remember correctly and there was metal trash in the same hole which might have hid the Merc from past detectorists.
Other posts have shared good reasons why silver might be hard to find in many areas.
I think a big part of the lack of silver is simply that over the years other detectorists have gotten to them first, and obviously since clad started about 1964 it has been a long time since silver has been dropped except maybe for rare exceptions.
I am thinking the better chance of finding silver is to get private property permissions, especially if that private property has never yet been detected, while that is no guarantee, at least if silver was dropped there in the past it still should be there.
Not saying you can't still find silver in public areas, but it might tend to be the very very occasional deep silver that past detectorists missed.
Also, while it also is no guarantee, if you ever get a chance to detect a tear-out of an old street or sidewalk before they recover it there might be a good chance of some old coins.