I didn't choose to be a lesbian.  I know of no one among my LGBT friends and acquaintances over the last 30+ years I've been out of the closet who have.  Why would we want to?  It's not easy being non-heterosexual.  Hate crimes, discrimination, judgements, shunning by friends/family/churches/other religious institutions, etc.  Why would anyone choose that? 

In regard to the state's anti-discrimination law, however, if you don't like that the law includes sexual orientation, you're free to speak to your representatives in Olympia and try to get the law changed.  Until then, the law is the law and it states clearly that people cannot be discriminated against based on the group to which they belong.

As far as your "special civil rights" comment... asking for a wedding cake is something anyone should be able to have if they want it.  Wanting what the rest of the world gets is a "special" civil right?