speculation and rumors about jenner hitting a fever pitch over the last few months. it made me who i am. reporter: jenner of course has been in the public eye since 1976 when he became an instant celebrity, winning the olympic decathlon and becoming known as the world s greatest athlete. then in 2007 reinventing himself as a reality star on keeping up with the kardashians. stepfather to four, father of six, as he prepares to open up to diane sawyer, it s that family he worries about now. those are the only ones i m concerned with. i can t let myself hurt them. reporter: amy robach, abc news, new york. and don t miss 20/20 s the interview. that s tonight 9:00 p.m. eastern right here on abc. whoa. i tell you, i ve had so many friends this week asking about when gma was going to start running clips about it, what time exactly it is. it s gotten a lot of buzz. and so many people connect with this.