Of course you can change. The human will is remarkable. I mean you can force yourself to have sex with a gender that you are not attracted to or as some does (catholic priests for example) not have sex at all.
I just say that I don't think you need to change that, homosexuality like race, colour and fetishes is nothing that is wrong unless it hurts someone else. I have gay friends and they are just like my other friends - they just get attracted and want to live with their own gender.
But... then I am against stoning, slavery and all those other things that the bible mentions and that I say are signs of the age it was written in and the minds of the authours. But... that subject we have already discussed