What to do, what to do

I haven't gone to my gym since August, which is when school started. I like my gym. It's right on the water, so when I am on the treadmill I enjoy watching the boats glide gently through the waterway, the occasional bird swooping down to catch a fish and then flying on. 

Do I particularly enjoy going to the gym? No. But I like this gym. 

It costs $43/mo. In the past two months I have given them my money without getting anything out of it. I use it the most during the summer, if it's really hot out, and during the winter, if it's cold out. 

I much prefer going on walks outside, but for some reason, ever since I was little, my lungs literally hurt when I try to breathe in the cold air. I don't know if it's just acclimation or what, but I know that exercising outside when it's colder than 50 is a miserable experience for me. 

So I have been toying with the idea of canceling my membership. But I don't want to because I know it's my own fault for not using it enough lately. I had wanted to get to the gym on a regular basis this year, but it hasn't happened. Teaching all subjects for 5th graders demands quite a bit of time, and sometimes, no matter how hard I try, it's 5:00 before I know it, and by that time the gym is crowded and you can't get on the machines you want, which also sucks.

So now I am still left with the question: do I quit and then rejoin if I miss it, or should I just try even harder to get out of school at a decent time so that I am competing for machines with other women?