I'm an INFP personality type.
Apparently this means that I tend to keep to myself. I don't need other people to keep me going, I draw my energy from an internal source. I find, in fact, other people can often exhaust me, and I tend to dislike large groups, particularly when a) it is a large group of people I don't know, and b) I am the centre of attention. This does not bode well for me when I have to do a presentation in front of around 50 people. Now I realise that 50 people may seem to some like a small group, but in my mind, 50... 500... same difference. So I am trying to prepare while also trying not to think about it too much.
No wonder I have a headache.