To raise or not to raise?

In low-limit games obviously you nede to be aggressive but it gets frustrating when your raises don't push people out. Obviously you gotta raise with KK or AA but I used to raise with anything down to JJ and sometimes 10-10. Now I never raise with 10-10 and don't even raise with JJ anymore because either someone will hit an overcard or someone will draw to an overcard with AK or AQ. QQ is sometimes even a limping hand now. At which point to you cross the line from the I'm-going-to-be-aggressive attitude and the they-are-going-to-call-anyway attitude?