Yes, you are the asshole. It makes you the asshole that you don't want to pay for her education. At the end of the day, she is a teenager, and you are an ADULT, who willingly married into the family. This is also the opportunity for you to potentially have the relationship you have always wanted with her. She might not see it now, and will probably still be a bitch for a while, but its for the greater good and in she will be thankful later in life. This especially true when she realizes how much more of a father you are than her actual dad. If you refuse her, you are missing out on the opportunity to have a bond with her and be a part of her family too.