If this is true with you, then it shows that you have not tried many other jobs, if that (job) is appropriate in this context because many will even argue to you that investment is not a job. Even if it is a job to some people, it is certainly not a job to many others, it all depends on how you do it and take/view/use it. Regardless, do not forget that there is Trading and Investment, if you can call investment the hardest job, what about trading that is way more harder than it? Needless to say, there are many other jobs out there that are more difficult and tasking than both trading and investment. Perhaps, you wanted to state that investment is risky. And indeed, that is best describing it.

There is no job/task without its issues, notwithstanding, without mincing words or causing controversies, the distinction between a true investor and a gambler is that the true investor fully understands what he is doing and does it according to the plan, but gamblers will always deviate from the plan, and this is particularly caused by emotions and some unforeseen factors, but are all psychological.