TW for body stuff

I try to work out 3-4 times/week in addition to going for long walks with my dog and biking (a short distance) to work. At one time in my life I did this with the goal of being skinny. Now that I realized that I'll never have the body that I "want" - and I am thoroughly critical of the reasons why I want to be skinnier - I work out because I want to be physically fit and healthy. I want to be able to climb mountains and run marathons and all that other stupid horseshit.

Admittedly, though, I still have this voice in the back of my head that tells me that I need to work out or else I will lose my fitness and (gasp) get fatter. So, on days like today where I am hungry and cranky and cold and I just don't want to go to the gym... I end up feeling horrifically guilty for skipping out on the gym when I don't have any real reason to do so. I know that I won't be ruining my fitness level by skipping on the gym just this ONE time, but I worry that every time I do this, my physical health is slowly deteriorating.

So, jezzies, what do you do when you feel guilty about not working out? Do you force yourself to go to the gym, or not? For me, I just want to sit in my sweats and wish that there was vietnamese delivery in my town...