You know, there is nothing wrong with being concerned about your weight and health. EVERY step you take now will give you YEARS of good health down the road. And it is common to have those not on board with your plan to claim that you are now "obsessed".
IF you have a nice social life, IF there is some flexibility in your plan, IF you have a reasonable amount of time devoted to exercise, and IF your diet/exercise isn't impacting negatively on your usual functioning, you aren't obsessed.
Hang in there, Chickie! I'm looking forward to seeing your before and afters, really really soon!
Kira