Am I going bald?

[RVR]

21 years old. Hairline is full and completely fine. I've included my brothers head as well for comparison (he is most definitely not going bald). He should be the first two photos wearing a headset. The photos were taken at same time in the same room so same-ish lighting. Also included photos with flash. All the photos were taken from an iPhone.

Um, my dad is bald, but he is the only one on both sides of the family who is. At all. All uncles and both grandfathers have full heads of hair.

http://s44.photobucket.com/user/Sonesful/library/

I might be obsessing over this a little bit and might be a tinyyyy bit paranoid but I love my hair I need it. So I need your guys' honest opinions please ty.