I'm bi (like 40% straight, 60% gay).
Yet my sexuality has been 100%gay for the last 15 years.
So, for me, it's a choice.
And I don't feel any pride, or any shame about that choice.
My partner is 100% gay, he would not be able to raise it for any woman, never had the smallest interest toward it.
He has no choice, but don't feel proud or ashamed about it.
As for the genetic part, it's more complex than having a gene for it or not.
Turtles and crocodile, for example, have no gene for gender. The are born male or female, but it's all about how warm/cold they were during egg development.
It's called 'epigenetic', the processes that shut off genes and turn them inactive or modulate how strong they work.
Homosexuality likely have an epigenetic componant, but as well be linked to early brain development, or both.
Think about the baby duck who end up adopting as 'mother' the first moving thing they see when they break the egg shell. Once it's done, it will never change. It' not a directly a question of genes, yet it's 'engraved' in brain forever.