Who do you think said this in a recent issue of the (London) Times Magazine:
"I've never really trusted what success I've had. I feel it to be fraudulent, chimerical and liable to be taken away from me in an instant."
It happens to be super-successful musician, DJ and producer, Moby. But it could be any one of dozens of successful writers, artists and musicians. This kind of insecurity seems to be extremely common among creative people, so, whether or not you consider yourself successful, if you have these thoughts that it's all coincidence and transient, be aware that you're not alone. (I think Epictetus got it right when he said you shouldn't get too excited about success or failure, because neither one lasts. Stoic philosophy comes in very handy when you're a free-lance writer.)
And if you wish you were famous, here's what Moby said about that:
"Fame is caustic, though. I wouldn't wish it on anyone. Initially, it's like you've been invited to the ultimate party, the one that will make you happy for the rest of your life, but it means nothing and answers nothing. These days, I'd rather be with an old friend playing Scrabble than talking to people I've never heard of at the MTV Awards."
Hey, we can play Scrabble whether we're famous or not...