I have not specialised in anything yet all options are really still open except it should be scientific. I could still go study physics or math.
I have had one internship, when I was only 14 (or 15, I cant remember) I got to watch surgery from real close for a week and the surgeons would explain to me what they were doing. That was the planned, scheduled Operating Room though. not the ER. It was very, very interesting. I'm sure the doctors and nurses were cool with me leaving again though. I was really being a smartass alot, in retrospect. Always asking nosy questions and having people explain their decisions to the point they told me it was enough.
The very first operation I saw was a lymf gland removal, in the armpit, to remove a dangerous tumor.
It looked very very sick and I preferred to keep my range. arm lifted up, gaping hole there, could see the joint and this sponge like substance the surgeon was fanatically pulling and twitching on and the whole site swabbed with brown "I"(what do you call it in english).
I soon got used to it though, and witnessed more severe surgery such as a reconnection of the great intestine, many, many other tumor removals (the rate of cancer was sick) and a Caesarian(I had never seen a child come to this world before, it was impressive. The father didn't know what the hell was happening I kept talking to him and he totally didn't realise what was going on)
I also heard the doctors talk when the patients were not around. It's desillusioning. They will mock silly patients, even if they have a severe condition, they will not use the euphemistic language they usually do, and they will complain about groups of patients they would not help if they had the choice.
I like the ER idea because it would put my tendency to remain calm and rational in heavy situations to use and because it is so instantly rewarding.
Either you stabilize the guy or you don't. No bullshit 5 month checkups and guessing whether or not you took the right decision. I like that.