Going Crown First?

Hey,

I'm 21, history of receding hairlines in the family (not normally this young) I'm not sure if its just fine hair, but after taking some pictures of my crown I fear I may be losing my hair from the back first. I'm not so worried about the hairline as I've always known that was going to go eventually. I am worried about developing a bald spot at the back of my head soon though. If anyone could give me a second opinion I'd greatly appreciate it, Thanks.

Pics attached taken over the last two days, no flash, just a regular light bulb directly behind me.

I'm going to assume that the lack of reply's means "Oh look, another paranoid idiot" and not "there's no hope, no point even trying" :)