NP or PA??? HELP!

Hello,
I am a pre nursing student right now, and have just applyed for RN school.... I will find out in Nov if I get in! (cross your fingers!!!!)
anywho...I am really struggling with what I want to do in the future....as far as nurse, or med school!!
How do you know which you want to do?? I know I want to be in the health care setting and want to work in a hospital....I am thinking l&D or trauma... but I guess I will figure that out once I am in my rotations ....???right???
One of my really good friends is a PA for an OBGYN and she advises me that if i want to be an NP than I should just be a PA?? But school wise that is a WHOLE nother ball game??? As far as right now ... I am gonna be starting nursing school in JAn, If I wanted to change to be PA (pre med) route than That would get me back about 2 years until I can start a program!! WHAT DO I DO!!!! I know I want to be a top dog, a leader and a teacher later on in my career.. I dont know if they have NP in the trauma setting??DO they... what roles do that take?!!? I really think with my personality i want to "call the shots" which is better...which way to go!? can anyone help me.... ?!