what makes serving so hard?

it's been a question of mine for years. it's not like I'm trying to point a finger at any one person; the Lord knows it could easily point back at me. but I'm just wondering why, even as saved and being saved people, redeemed and being redeemed, filled with the Holy Spirit, we, you and me, more often than not, struggle with the idea of serving? one thing I don't believe is something someone once said, or at least I thought I heard, "it's not serving if you enjoy doing it." I don't believe that. at the same time, I don't think whether you enjoy "it" (whatever "it" is) or not matters as to whether or not you do it or not. but why do we find it so hard to serve? it's not like I really enjoyed emptying the sink of dessert plates, utensils, and coffee mugs last night after our small group left our house. but it's not like I felt like I was dying because of it either. I did it because, a) [as my wife often says] it was there and needed to be done, and, b) I didn't want my wife to think I was leaving it there for her to clear out. yet I have to say, my natural inclination is not to serve. maybe I'm way off. maybe this is just my issue. maybe this is the area of the "old" man in me that is awaiting and undergoing sanctification and transformation. I don't know. I just find that sometimes I don't want to serve. what about you? what do you think?