Don't forget as well that any odd shapes we might notice ourselves in the mirror are often not noticable to the casual passer-by, or when we are on the move. We know where to look for them, and its all too easy to be self critical. For example, the left side of my noggin sticks out kinda square compared to the right hand side, but I can't do anything about it except take a chain-saw to it!
Your forehead is small and your head is small too. Just take a look at mine, my head is really oblong.
Your forehead is small and your head is small too. Just take a look at mine, my head is really oblong.
Oh woe is you, give it up already, will ya!
You can't deny that my head is more oblong than usual...
not again!

Your head looks perfect to me, just as normal as anybody elses. No problem that I can see.
You can't deny that my head is more oblong than usual... 
you have a good jaw/chin combo working, that makes your face evenly proportionate, for your own sake you should stop focusing on just one aspect.
its not oblong-rest up today would ya!