Similar reasons here YW.
I was born with surname 1. I became 'known as' a different surname when I was 10 and my mum remarried. My mum never legally changed it as my Dad would never have agreed.
At 16 mum divorced, and it was the point where I was leaving school. I was pregnant, and had just done my exams. So I kept the other surname until that was all over. Then I just started using the surname I was born with again.
I don't like my surname. I don't think any name goes well with it unless it is a very traditional name. Both DS's names don't sound right with it. My own name, when I say it, I have to say my full name when I introduce myself. The nn that I was given ends in a y, as does my surname. They sound silly when said together - to me.
So basically, I either avoid saying my surname, or give people my full name when I introduce myself.
I didn't want to give my children a name I disliked, or a name I wanted rid of myself! It might be the name of a lot of my family, but I feel nothing for it.
I'd like to be proud of my name!