"I can't let myself hurt them," Jenner said to ABC’s Diane Sawyer, and that family members are "the only ones I'm concerned with."
Jenner has six biological children -- Burt, Cassandra, Brandon, Brody, Kendall and Kylie Jenner; and four stepchildren -- Kourtney, Kim, Khloé and Rob Kardashian.
“My whole life has been getting me ready for this,” he tells Sawyer. “It made me who I am."
The former Olympian, 65, will reportedly bid “farewell to Bruce” when the two-hour “20/20” airs Friday, April 24 on ABC.