start thinking

I heard somewhere that if you have to be succesful in your life and want to achieve something then , first you have to start thinking right? And I think for that thinking is the first step to achieving something . Because thinking gives you a clarity of what you have to do in your life and to have more focus about your goal but I have experienced a lot of confusion in my thoughts like what should I do and the first thing that I can do is to start thinking
But doing nothing won't help you that's why start thinking but with a lot of confusion i got frustrated by myself and feels demotivated but I know that doing nothing won't help so I deciding to work on my self discover myself and start writing so that I can have a clarity in my thoughts so what I have done i write my thoughts in my diary and picks up the most important thing like if have a write the skills that I have picked up tha most important skills and the most important thing is that have a interest on that skill also so the first step is start thinking right?