What healthcare pathway should I decide to major in?

I'm going into my Junior year of high school, and although I know I still have some time before applying to college, I was wondering if there was a way that could narrow down some of my options. Some options that I'm considering are

- emergency medical paramedic
- emergency medical technician (emt)
- labor and delivery nurse
- physicians assistant
- surgical first assistant
- neurosurgeon (or assistant)
- sports medic

I don't get really nauseous at seeing blood, or anything like that. I honestly just don't know that much about each of those careers. I've done some research already, but it would be helpful if there's any first-hand experience of those careers that you guys could share with me, or if there were any classes that you think would be extremely important for me to take during my Senior year.