YANBU I felt self-conscious enough about doing PE with girls. I'd have been even more miserable at doing it with boys. I was small and was knocked over countless times playing netball and hockey with bigger girls. That couldn't be helped, but playing against boys, I'd have been marmelised.
One of the boys' PE teachers once took his favourites to watch us jiggling about playing volleyball once. That was a good experience
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Luckily the head of girls' PE spotted them and came out of her office to tell them to clear off. I expect she probably had words with the teacher who was taking our lesson and did nothing but simper - he was the school heart throb - and a pervert, now I think back.
I was very good at swimming and can still swim faster than many men. But that doesn't mean to say I enjoy being in a pool with some of the more aggressive men who don't like being beaten even though I'm not competing with anyone but myself. They're bigger and what a pissed off over-competitive man does in that situation is rock the water so I end up either moving, or getting out because it's a mixed pool and I accept that.
I'm happy to go to a mixed gym too and like the free weights section which is mostly used by men. I've only met two men who were unfriendly out of hundreds and they were just weird. But I wouldn't do contact sports with a man.
It's all very well PPs saying PE should be about learning to play the game but you cannot take competition out of it - nor should you, really - and when some people's blood is up, they do reckless things.