"I can't let myself hurt them," Jenner says in the new promo that will begin airing on the ABC Television Network tonight.
Jenner has six biological children -- Burt, Cassandra, Brandon, Brody, Kendall and Kylie -- and four step-children -- Kourtney, Kim, Khloe and Rob Kardashian.
Jenner, a record-shattering, gold medal Olympian and reality television star, talks with Sawyer about the journey through the years, and says in the promo, "It made me who I am."
Jenner sat down with Sawyer for a far-ranging interview that will air on Friday, April 24 during a special two-hour edition of “20/20.”
The special, “Bruce Jenner – The Interview,” airs on ABC at 9 p.m. ET.
“My whole life has been getting me ready for this,” Jenner said.