Something different

I don't know what's wrong with me. I always want something different. I haven't even stayed at one job for a year yet. At first I thought it was because I was underpaid and bad management, but know I have a great job. It will be a year in May that I have had this one but I find myself on Craigslist looking for a new one. I never finished school because I switched my major so many times. Is anyone else like this?