Neither you are crazy nor you are the only with such feelings. I am a 3x entrepreneur, have sold 2 companies and 25 years old. I am working for the acquirer of my last company for last 14 months and I am already tired of writing code for someone else. I am all set to leave my six figure salary and keep hacking & building products that inner me wants to build. Believe me, getting a job at the same pay scale will never be a problem for you. Go ahead and start working on your own ideas full time.