accepting being GAY

I have had for years considered myself straight. NEVER thought of being Gay. About five years ago my attraction to having sex with men has incresed by watchung Gay porn to the point that I have little interest in having sex with woman. Having sex with men excites me enormously. The last few years, I have sex only with men. Have I always been Gay and became aware of being Gay when I sarted enjoying watching Gay porn, which excites me enormously? Also is this just a stage in my life and if I am Gay, how can I come out of closet