I can understand where you're coming from. I also find myself resenting my pain, and getting angry at it for making me weak, i.e. having to be gentle with myself rather than "toughing it out", like so many people do, and I did before the pain...
Most of all, the pain isolates. It hurts that other people have no idea what it's like, and expect more of me than I can do, physically and emotionally. They don't realize that putting pressure on me, or causing me stress, has the opposite effect of motivation. Yeah, I feel like such a wimp sometimes, but when that feeling subsides my body calms down and responds.
Since my TMS I feel more alone, but also more deserving of setting my own limits and pace in everything I do. Hell, when I think of it, I can do all I could before I got the pain, even better. And it's not a race. I just need to stay mindful, calm and positively-motivated, i.e. by the sweetness of success and promise of improvement, not by coming second in some competition with someone else.