Help me stop pulling my hair out...?

I need to decide on a career soon...and that means within the next few months. I feel like I need to choose something and stick with it - for a long time. That kind of pressure really freaks me out. I just can't become a serial job changer - that will look bad. I am in my second full time job in three years (since college.) I just have so many interests that I can't seem to pick something. I know I am destined to do something great in my life ~ I am just scared shitless. I want a job that I look forward to and don't dread. The problem is I am interested in so many things from the criminal justice field, to the medical field, to working in a library or museum, to teaching... Help me stop pulling my hair out. Any advice would be appreciated ~ especially from people who have worked in the above mentioned areas.