Rather than worrying or stressing out about having to grade, just accept it. Grading is part of the job.
Grading and returning papers quickly can actually have some positive results. Students appreciate getting papers back quickly. Many of them like to know where they stand, and grades give them feedback. The sooner the better.
Students often view slow paper returning teachers as lazy. This is probably not good for the teacher/student relationship.
Don't see grading papers as some waste of time or hassle that you have to suffer through. Know that some good will come of it.
Your students will be the ones who benefit.