a simple question

I've been "addicted" to reading all these forums for a couple of months now while I've been trying to decide whether or not to become a nurse. I have a 4.0 now, and really don't mind the studying, it is just that after reading and reading and reading, I am sooo discouraged! It just seems that there are so many people that hate what they are doing! I am not an assertive person by nature (although I have 4 teenage sons that I have no problem handling ) and that worries me quite a bit. I love helping people, and I think I would truly love working in NICU or L&D. I worked in an OB/GYN office for 3 years many moons ago and loved that (as an aide). My question is...are any of you quiet and passive by nature, and if you are how has it been for you working as a nurse? Are there certain areas in nursing that might actually be better for a person that wants to help people, but isn't quite bold enough to stand up to doctors etc. I know this is a weird question, but all these pre-class jitters are wearing me out!