Can a person become gay? no, but circumstances or experiences can develop a guy's curiosity and make him discover that he enjoys sex/relationships with same sex. The main difference is that gays rarely need an experience to discover they like guys, they just do. It just the way God made you? yes, it's determined at birth..but sexuality changes and matures, so one never knows what the future holds.
I think it can be a repressed feeling for a very long time, often people squash any weird feelings twards the same sex and see those feelings as having been something else. I know I have always had some feeling for the same sex, but society said I should be with a man. But I now know this isn't necessarily right for me!
I wish being gay was my only issue... lol. I was born bisexual, and transgendered; I thought something was odd when I was 7. I began to feel attracted to a certain boy, whome I still love, and later that year, a girl. By the time I was 12, I knew something was wrong... When I was 14, I nearly came out under the name of Lyla, but chose not too; and closeted myself, yet again, for 3 years... Now I'm out; I've accepted myself. It's not like I chose to be this way... If I HAD had a choice, I would've been born as a girl.
I can't remember being any other way. If people "become" gay, it's possible that they are just coming to realize it or accept it at a later age.
I've always known I was different somehow. Until I discovered a word for it before the age of 9, I didn't know what it was that made me different. Unlike what many close-minded straight people I have met in my lifetime think, gay people do not wake up one day and decide that they want to be gay and forever be cursed by society. Either you have been aware of it for a while from an early age and were just in denial, or you've grown up with a picture of what you are supposed to be and until you become curious, never notice that you aren't straight after all. My boyfriend is like that. He lives in a Christian household, and all his life he was given the image that he was to be straight. He dated girls growing up and never once considered that he might be gay until his last relationship with a girl went badly. He couldn't see what all the hype was about with other guys and girls. At 17, he became rather curious. Since his relationships with girls never worked out, he decided to try one with a guy. Then we met online and we got to chatting and out of the blue he asked me to be his boyfriend. I accepted and we've been a couple since. However, he was still somewhat confused about his feelings. He at first thought that he was bisexual. As we talked more and more and continued to fall deeper in love, though, he began to realize that he didn't really have any sexual attraction to girls at all and was only attracted to guys. So it's something you are born with and when a gay person comes to terms with it depends on the environment they grow up in.