Why do I dislike my partner's new appearance so much?

My boyfriend has just shaved almost all his hair off, he used to have long dark hair and now he has a Mohawk type thing. I hate it! I don't find him attractive anymore and I struggle to bring myself to look at him.

I sometimes find myself lost for words now as well when I am talking to him. I don't know if I'm over reacting or if the relationship's come to an end.