Jessica is so right.
Each one of us is a unique individual. We look different, we speak differently, we think differently, we are born in different cultures. Heck, we come from different ends of the earth with different life experiences, so it in makes sense that our creative writing processes will be as unique as we are.
And that is okay. Diversity is (mostly) a good thing!
So embrace your process. If it works for you it's the right process for you. (It's when it doesn't work that you really should question your process!)
So stop the self doubting and get WRITING people!