Guilt. Where does the line lie?

I feel guilty.  Yet I feel right.  How does one reconcile that?

I feel guilty because out of about 50 rough drafts turned in by my students today, I have reviewed and made suggestions on five.  If we don't have the corrected drafts for class tomorrow, I will have to change my lesson plans at the last minute.  I put in five paid hours a day at work.  Grading all the papers would have taken me another two or three hours, ballpark. 

I feel right because my family is my MOST. IMPORTANT. JOB.  When I leave the school, I need to turn off "school me" and turn on "mommy me."  Other than an evening email check in case of urgent questions about homework, I try to leave work behind me when I come home. 

But still, the guilt.  The feeling that tomorrow will be utterly overwhelming because I left something undone today. 

Lord, Please help me to make peace with my humanity and my imperfection, with myself.  Please help me to adjust and cope.