Moving Ahead or Just Moving?

I am so not a mover. I am a settle in and get comfortable and grow roots type of person. So, with this in mind, why am I so determined in my desire to "move ahead?" Why not be content where I am in this moment in time? I would say, it is because I know there is something better, more challenging, more mentally stimulating down the line and complacincy just doesn't feel right. So, am I working on moving ahead or just plain old moving?