thaiboxing is a rough sport. You are going to get broken toes and broken bones, you will get cuts and bruises on practically all parts of your body, if you compete you most certainly will carry an injury almost constantly (train around the injury).
There are risks involved just like in any sport. If you dont like the pain, or cant seem to get your head round the sometimes insane mentallity that is required to fight Thaiboxing then dont do it.
If you dont want to fight and dont like the pain involved with shin kicking and dont want to risk the cellular damage by solid impact of shin bone against shin bone which can lead to cancer then wear shin pads!
No one is forcing you to take part in Thaiboxing
you have a choice, you can wear shinpads, it wont make you look tougher...
but at least you wont feel the pain. If you worry a lot and always complain about the pain then you've probably picked the wrong sport because pain is integral to Thaiboxing.
enjoy, just forget about the risk and do it.
yes that seems crazy but mate we are all going to die someday! I love it so I just ignore the risks involved.
A body is only that, nothing else.