Trying to Leave the Gym of Shame

I actually need some legal advice.

I enrolled at my gym this time last year. The "contract" (though I never got a copy of it - it was all done electronically) was for 18 months, which I thought would be enough time to get me in shape. I loved the variety of classes it offered and enthusiastically signed up for a few. I loved the pool and immediately ran to find a fitting swimsuit. I absolutely adored the variety of machines and training areas. I was thrilled and giddy like a little girl.

The problem is, after the first 6 weeks, I never wanted to set foot in there again.

I have never felt more alienated or humiliated in my life. Ever. I am used to getting the random looks at the gym. And that's fine, because I always said F-U to everyone and stayed focused. But this time it was too much. People came up to me and laughed at my panting, pointed out my sweating, mocked me by saying "is that all you can do" every time got up from a machine. Girls were mockingly panting heavily when we finished a set in class, and I was told several times to go to the back of the class since no one would be able to see themselves in the wall mirror if I was in front.

The worst part was the dressing room. How many times I heard casual chatting about how these other women would "die if they ever looked like the Michelin girl". One woman actually approached me to ask me why I was going to that gym which was for "fit people, those who are already looking good, you know?" It was not a haven to work out, it was a hostile environment where I was fat-shamed. Even remembering it makes me feel so absolutely devastated and close to tears.

At first I politely protested to the front desk and then the gym owner himself. It was a big gym, with many franchises, hence I had picked it in the first place - the reception was so poor I actually cried sometimes when I got home. I explained how horrified and astonished I was to receive such comments from the gym members. They told me they are "just as shocked" and will look into it. Nothing happened. I eventually stopped going.

I have recently moved from that neighbourhood and resumed my weight loss struggle. I have found a local gym very close to my new place - and it is perfect. It does not compare in any way to the old one in terms of facilities or equipment, but I have been going there for 2 weeks now, and not a single day goes by when someone does not come up to me to say something nice or encouraging, or offer me a smile. I do no longer feel like a whale in a school of eels. Or at least, the eels seem to welcome me to their company.

I have conveyed all that to my previous gym, the emotional distress and the moving out of the area, and asked to cancel my subscription. They refused to allow me, because I am still within a 10 mile radius from one of their gym facilities, and it is a term in my contract that I cannot cancel unless 1) I move further than 10m from their gyms, 2) I move out of the country, 3) I am financially unable to pay, or 4) I am physically incapable of attending. I insisted and let them know I was told I could cancel when I first joined, and they sent me a copy of my contract (the first time I got it in my hands) where they pointed out these terms. I had never been informed about them

I really don't want to keep paying their ridiculous fees for facilities I haven't used in 10 months, and am now nowhere near to. Especially after the pain they've cause me, and the comparatively vast difference with my new little-gym-that-could. I called them on the phone and pretended to be a new customer, asking about the gym, and their agent told me that yes of course you are able to cancel your contract if you so choose. I asked if I could do that at any time. No mention of any special conditions.

I still have 6 months left. Is there any way I can get out of this?
P.S. I am in the UK.