Why do I bother paying CSA?

i have a small girl with my ex, who i have never met, many factors of this, i was constantly away in the forces, she always made it difficult and before my daughter was born we had a son that i payed for legitamatly through pregnancy and up until he was a year old, when i found out he was not mine.

Before you say anything, yes i was stupid for going back there and now the dna results have come back positive i have been very cooperative and have not disputed anything, i have since been in touch with my ex who told me that my daughter sees her husband as her father and there is no point of changing things, all her kids (5 by 5 different men) have the same surname…her husbands, and that she wants him to adopt her i have all the texts to prove it, im just stuck on what to do now??

i wouldve liked to build a relationship with my daughter but obviously her mum thinks differently and still wants me to pay CSA? surely if im not allowed to see my daughter, and her husband is the “father2 why the hell am i paying CSA? she also said she never wants her to meet me or have any contact as it would confuse my daughter?

Please help me.