I love flying. Sure there are times when you want a 4 day trip to be over and sleep in your own bed. But who doesn't get tired of their job every now and then? Its everything you make it. Keep a positive attitude and it will always be fun.
My grandpa started working for capital airlines in 1954. He stayed there and was eventually merged with United. He still tells me everytime I see him, (because he has alzheimers and can't remember) that he "never had a job because he was paid to fly airplanes."