Sardo

Can't get an invite

I'm fairly new to Oq and am probably not using it right. I go into it and find raids I want to be invited to and hit the wait list button. I can sometimes wait for hours without an invite. I'm a fairly well geared 553 warlock and am capable of doing pretty nice DPS. I'm trying to get into the 10 or 25 man heroic raids with no success. Never gotten an invite. Am I invisible? Do I need to "find mesh" each time I go on?