None of us automatically have a signature, so how did you develop yours? Did you practice different styles until you settled on one you liked? Did you just make one up the first time you needed to sign your name? Did you copy someone else's style?
I observed different people signing their names. My mother has the most beautiful old fashioned writing (not printing ). Her writing is much like calligraphy. I copied her writing style, adapted it to incorporate pieces of other signatures that I had seen and liked, and just relaxed their styles to suit me.
I wanted my signature to have some flare. I practiced different signatures until I found one I prefered. That is the one I chose. I have recently had to give my signature some thought again. I developed a variation of my signature for my art. I put 16( for the year ) then my name in one direction and my name in mirror writing in the other.
I think over time it just came to be, if I am totally honest.
So long ago now...
I do remember one day I had to sign a lot of documents, with my husband for a new house and it never changed after that.