Anyone else feel like they HAVE to work out a few times a week? Stress yourself over it?

I never used to but now I do cardio and some weight training. Just at home. It stresses me out. It's always on my mind. I worry I won't eat enough to work out or eat too much and not work out. im very thin and I'm just stuck between a rock and a hard place. I know it's healthy to work out but I stress myself out with it.
I used to just do it when I got to it. Cardio a couple times a week, strength once or twice a week.

How much do I really need to. Why do I?
Anyone else feel like they HAVE to work out a few times a week? Stress yourself over it?
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