Problem getting a U.S. passport?

Hello, I'm having trouble getting a U.S. passport because I have two birth certificates, the original one is from Texas where I was born, my parents were both permanent residents from the United States but they decided to live at Mexico when I was born, then when I was going to attend school at Mexico my parents registrated me there then they got for me another birth certificate, but now that I am an adult I decided not to live in Mexico because I was born at Texas, and now the problem is that I can't get a passport because I have two birth certificates, one from the United States and one from Mexico, I already sent my american birth certificate, a letter from the doctor that delivered me and that's all, I don't have any school records from the United States because my parents decided for me in that moment, I wasn't aven aware of these, does somebody had the same problem? It wasn't my fault, it's not a sin that I lived in Mexico and attended school there, please help