Why is my hair less in the middle of head when compared to all over my head. (photos)

I suggest seeing a hair loss expert now to evaluate and go over your condition and provide you information about your best treatment options. There are great non-invasive options like prp/progesterone and/or hair transplantation. See an expert. Best, Dr. Emer

An organic shampoo as well as medications like Finasteride and Minoxidil can be very helpful in maintaining and keeping your existing hair.

Learn as much as possible about your own hair loss by looking at your past pictures, and your family hair loss history.  

You are describing a phenomenon known as patterned hair loss which is typicall seen in male pattern balding. Options for male pattern balding include finasteride, minoxidil, laser, PRP.