There will be various opinion about is trading lifetime job or not, but there is no doubt about those points you mention. Honestly trading are not enjoyable. It always gives people stress. Even sometime I can't sleep while my trading is open. What is about what will happen in next minute. Market is very unstable. besides losses very common Factor in trading. It needs experience, patient and strong mental ability to keep trading continue. So after a certain time, you mightn't go for trading.
When someone trades of course someone will always be under pressure if the decisions they make in trading cannot give them a profit and we will always wait for the results of the trading we do, if we choose trading as a lifelong job of course it will require us to I can analyze the market well and I myself find it very difficult to control my emotions when trading and I think it is difficult for me to make trading a job and make trading more of an additional income and we don't have to always trade which can make our emotions not good, of course this is will affect our health too.