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My biggest insecurity is that I'm never good enough for my clients. That other PTs are doing a far better job. Then I remind myself that we're all pretty crap at something. One of my clients literally records himself doing workouts, posts them on Instagram, and then gets his clients doing the exact same thing. Another claims he's going to 'get shredded' but then ends up having to hire another PT to do it because he doesn't bother putting effort into do it properly... or likely doesn't actually know how.

Whenever I teach classes I always worry if gym members enjoyed the class. Sometimes they can be quite repetitive in the way that I do them, but the exercises themselves are always different, and my cycle routine is different every single week. But I always worry I'm not doing a good job and they won't want to come back. I mean, they do. My classes on Monday especially are always fully booked, but sometimes I just think people just turn up because they want to purge themselves of that weekend binge or just want exercise.

Whenever these sorts of things happen, I remind myself that I always ask for feedback, and if nobody says anything, then I'm doing pretty ok.

In relation to your issues with sweating, you could consider getting a metal water bottle and putting ice cubes inside it. I've also read that putting something cool on the wrists can help lower body temperature... but I'm not too sure how reliable that one is.