Am I Balding?

[ArthurAardvark]

http://imgur.com/a/STZBp

I'm 18. (The first two photos are before I washed my hair and the rest of the photos are after I washed my hair) What is that streak on the crown of my head in the first two photos? It sorta turns into a swirl after I wash my hair, so could it be cowlick or hair part? My hair is pretty thick all around.

I never take pictures of the crown of my head but I just noticed this. My father is 68 and he still has a full head of hair. The hairs on my crown usually tend to stand up so I don't know if I'm balding or if it's cowlick. I rarely see, if any, hairs on my pillow or when I brush my hair. Some hairs fall out when I wash my head but that's normal.