It’s the not-knowing that is the most haunting. I know I’ll never be able to take martial arts; I have made peace with that. I know I will never be an amazing athlete; I have made peace with that as well. Same with my body composition: I will never be rail-thin, I will never “fit” into most “fun” cars even when I finish my weight loss journey, I will never be the kind of guy who can fit into a Medium of anything clot…
That being said, there is a Limitless episode with Chris Hemsworth that might resonate with you, especially regarding martial arts. Watch season 1, episode 6, called "Acceptance". I had never watched any other episode of this show, but late one night when the whole house was asleep I was browsing and came across this episode and thought "hmm, looks like a good bedtime show". Ended up watching it and you'd have thought someone was cutting a thousand onions in my house. In fact, our Golden Retriever turned into a service dog that night hah!