(Reuters) – Britain’s double Olympic champion Kelly Holmes has revealed she is gay, saying she was nervous and excited about coming out in a move that could have saved her years of heartache. The 52-year-old, who won gold in the 800 and 1,500 metres at the 2004 Games in Athens, said on Saturday she had known she was gay since she was 17. “I needed to do this now, for me. It was my decision. I’m nervous about saying it. I feel like I’m going to explode with excitement,” Holmes told the Sunday Mirror newspaper. “Sometimes I cry with relief. The moment this (interview) comes out, I’m essentially …