You talk of passion, but speak in terms of escapism. It sounds like you have some personality flaws. From your short description, the writing describes someone who appears unfocused, impulsive and unreliable. If you were slave to your clients (working on your own startup), would those traits magically disappear? Also your root motivation for quitting is suspect. Don't quit because of boredom or from feeling empty. Quit because staying at your job is preventing you from taking full advantage of a growing opportunity from one of your side projects.

Also, advice on success is very situational. To replicate Arnold Schwarzenegger's success, you would need to go through physical child abuse and develop a deeply rooted negative self image. Somehow he got over it, and channeled those flaws into body building, real estate, and movies. Did he do these things because he felt unworthy and strived to become worthy? Would you want to be tortured and abused during your childhood if you had a greater chance of "success" in adulthood? For other wildly successful people, what demons are they hiding?

Whether you decide to work own your own startup full time, or stay at some job, I'd urge you to increase your chance of future success by working on yourself. Read books, do exercises, see coaches and mental health professionals.