I don't have a problem with serving usually. What I do sometimes have a problem with is always having a great attitude about it.
You know what helps me? Remembering that the ones I am serving are loved by Jesus.
If you are a parent you'll understand this. When someone shows your child kindness just because, that will touch your heart big time (at least it does mine).
So, when you show love to others, when you serve them with joy and kindness, when you go out of your way for them, it blesses God big time because He loves those people.
Love others for Jesus. It really does bless His heart.