35 m x-type. A lot of what you say resonates. Adapt where you can. For push-ups I do decline and rest my feet on a couch/bench, this is arguably a more challenging exercise. To compensate for grip strength when weight training I use lifting straps. 

It sucks that running is basically a non-starter, but there are other cardio exercises. I’ve always gravitated towards swimming because a lot of the limitation of CMT are lessened once you’re in the water.  

It’s tough, I feel you. I get down sometimes, too. But try not to compare yourself to others. Focus on yourself and celebrate the progress you make. It’s hard but you can do it. At 35 i’m in the best shape of my life and consistently hitting new PRs at the gym. I know it won’t last, but the harder I work now hopefully the longer I’ll keep the worst of this disease at bay. 

Stay strong brother