You are not ready to start yet. Execution is scary. Sometimes people stall and make excuses like-not right idea or partners or no money etc. truth is when the passion strikes nothing will stop you. You need that drive to succeed. Be honest with yourself. Also be open and patient and when the time is right you will do it. You seem very passionate and motivated so I think you will know when you know. Until then enjoy whatever job until you are ready for the leap. Start with a small problem you personally want to solve for yourself. See if that solution has a market while you work on the cheapest and leanest prototype. Good Luck.