I can't speak for everyone but I think most people feel like this. I'm not old enough or experienced enough to tell you if you should rattle the cage or stay the course. I've been wondering a lot myself if I'll be in your same shoes 5, 10, or 20 years from now, since I've officially begun life as a professional. I was sure this was the direction I wanted to go but now I'm wondering if I'm going to feel fulfilled where I am, or if I should have tried pursuing something bolder and more punishing like academia. I felt very weary and disenchanted with it as a student though. I once saw a professor talking in a candid setting for a roast in his honor, for his distinguished contributions. He said it was strange to him to be recognized by the group since he considered himself a failure. He talked about how his career had been marked by a succession of disappointments. So I'll watch this post and the replies eagerly. I don't know if any of this helps you, but I think you're not alone.