What Lynda said. From your yDNA results page at Family Tree DNA, there's a pulldown option to view matches based on the 12-marker panel, 25-marker panel, and 37, 67, and 111, if you've tested that high. If you aren't seeing viable matches at, say, 67 markers, back it up to 37 and check. There are still a lot of older kits on file that have only 12 markers tested. If you're a perfect 12-marker match with one of these in the same surname, it may well be worth an attempted contact.
I went almost a year before I had my first yDNA match, even at 12 markers...but that was in 2004 when there weren't many test kits on file yet. ;-)
If this isn't the issue, maybe you could elaborate a bit so we can try to offer some help.