There won't be a good strong answer for this but I can assure you that many of us have the same doubts as you (after all we are living in interesting times)
but in general:
Don't feel bad if you work hard
and Don't feel bad if you don't, rest is just as important (people who overwork are often not aware of it)
the sad truth is that many creative people only do it as a hobby and have a well paying (or not so well paying) boring regular day job on the side (those who can make a living out of their creative work are the exception)
most importantly be aware that hard work doesn't necessarily lead to success (there are many other factors out of your control)
but in case success happens: don't feel bad about it