"alright-so when did you 'choose' to become straight?"
If you reread that passage from Romans 1, you will read God's reference to "natural relations" contrasted against behaviors that go against normal human nature.
Still, you are a fool if you think that the opportunity to explore such a lifestyle is not readily abundant. I was once assaulted by someone that went to the same school as I did, though I was younger than age 7 at the time. At any time I could have chosen to do so, especially during my atheist years.
You see, true Christians are not "born that way", nor are they raised to be Christians- it is an individual choice each person MUST decide for themselves, regardless of upbringing. So I have, like ALL humans, stood at many a fork in the road, and have since chosen God's way vs my own way.
I understand that many so-called Christians you have likely encountered online are not prepared to defend what they believe, because they often have no idea what they believe. Not so here. I hope this helps you.