I suggest that you spend some time studying the vast amount of research done, both on animal and human sexual orientation.  You aren't going to find it in any church newspaper, however.  The church, for the most part, pretends that it doesn't know that any of this has been written.  It is just as the church won't teach the people that the first chapters of Genesis are mythic---not historical. This is true,  even though Fr. Georges Lemaitre, S.J. proposed the Big Bang Theory---and that brings to question how humanity began---not in a Garden, but hanging in the trees, where they evolved S L O W L Y into homo sapiens. 

People's sexual orientation is formed in the womb, not by choice.