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A person doesnt choose to be gay,it is no more your personal choice to be straight than it is theirs to be gay. You cannot choose your sexuality.
You can choose to have a sex change but most of the time it is not a man simply chooseing to be a woman or a woman chooseing to be a man,their is often other complictaed motivations for that,which are usualy not about choice.
What you are talking about is called life,things that make us who we are affect others around us that is how life works.
Another thing you need to learn about is tolerance for the different kinds of people that are who they are,like yourself I am sure the way you live or the way I live has affected others at some point in our lifes.