Can I really do it?

Ok, it is at this very moment 2:33 am.  I am sitting at work...calm down folks im on a break....and I am surrounded by a half empty coffee cup...a full coffee cup for later...a chocolate cheesecake..a pack of oatmeal just waiting for 4 am and countless other snack items. I have always been skinny, in fact so skinny that people used to ask me if  I even liked to eat...or if  I had a problem with keeping it down.  I mean you could count my ribs and grab me by the collarbone. Did I eat? Yes.  Did I keep it down? Yes. Does an abnormally skinny person have as hard a time as someone who is overweight? In my opinion YES. However with the birth of my son came 20 glorious, wonderous pounds. I finally looked healthy! So one day I decide to join the Army because I want to be fit.....well fast forward two years from then and here I am 27, 135lbs and unable to pass a pt test! I work in a hospital and physical exercise is just not the same as across the street.  I realize now that while I am within my target weight right at this minute I seem to be gaining a steady pound a week. It is time to get myself back on track, find my motivation, pass my pt test and get back to comfortable me weight of 125lbs!! The only question is....Can I do it?