I want get a paternity test and my wife does not?

We have one little girl who I love but looks nothing like me or her mother. We had our daughter exactly 9 months after we meet and basically it came down to like the second time we had sex about 2 weeks after we met. I am scared to find out and I hope that she is my girl. My life revolves around my daughter and... show more We have one little girl who I love but looks nothing like me or her mother. We had our daughter exactly 9 months after we meet and basically it came down to like the second time we had sex about 2 weeks after we met. I am scared to find out and I hope that she is my girl. My life revolves around my daughter and I have given up my life for her and I want to make sure. My wife hates that I ask, but I think she doesn't understand. My best friend just tried to have another child and found that he could not have children so he had his daughter tested and found that she was not his so that makes me wonder even more. Understand that I love my family but I want to know for sure it is my family. My question is what do I do?
Update: My daughter looks a little like my wifes ex and I have been saying I want a test all along. I just don't understand why she is so upset if she has nothing to hide.
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