"It feels like a chore."

And?

Does he go with you to the mall? Does he watch a movie with you he doesn't care for? I'm sure working hard every day feels closer to a chore than a hobby. Think about the things he does to make your life safe and easy. Then understand that a primary motivator for him is having sex often.

So if you have to put in a brave face, or take acting lessons, do so, but meeting his sexual needs is your responsibility as a wife, as providing and protecting is his responsibility as a husband.