How do I find out if there was ever a child support order on my behalf

are you old enough to go to the county courthouse and look up records?  if you are, then go to the courthouse in your county, and from there, go to the department where they keep the child support records  In PA that's usually the Prothonetary or Department of Court Records.  Tell them both of your parents names, and ask for their assistance to see if there is any child support order on record. good luck!