At your age you have so much growth to do before things stabilize for you(you are in the middle of the biological throes of adolescence at age 16), that its really not advisable to try to delineate this for you.
Besides, until you understand how you deal with change and how your brain works to ascertain the environment, you won't actually understand how the nodes work to help define your mission in life.
BUT that said I'm sure that many people here will tell you any how.
I would suggest that you just learn about general astrology and try to chill out until at least you are 20.