Am I going bald?

[Mickey93]

Hello..my name is mickey and i am 18 years old, as the title says i dont know if i am balding and i would like to hear your opinion and maybe give me an advice.
http://imageshack.us/photo/my-images/571/52800513.png/
http://imageshack.us/photo/my-images/696/11447134.jpg/
http://imageshack.us/photo/my-images/546/33613279.jpg/
http://imageshack.us/photo/my-images/152/66030701.jpg/ As you can see on left side is like this and on the right side i didnt had hair since i was born i think, so its this what a mature hairline should look or i got a big forehead or going bald?
this is how my hair looks normally http://imageshack.us/photo/my-images/717/img0665av.jpg/
Ah and yeh no one in my family is bald, except my grandfather on my mother side but he is 72 :| , also if i dont have beard means my dht is low?
Thanks you in advance and sorry for my bad english!