The 15-year-old daughter of Johnny Bello, considered one of Peru's greatest ever swimmers, was eliminated from the 200m freestyle after clocking 2 minutes 4.95 seconds in her heat on Thursday, Xinhua news agency.
"My time wasn't good. I beat my personal record, but I didn't meet my expectations because I wanted to finish in 2:03," Bello said.
"I'm always trying to improve my times and I'm very competitive. When I don't get the time I expect, I get a little angry," she added.
Samantha, who has also represented Peru at the world junior championships, said she hopes to improve on her dad's achievements in the pool.
"I would like to surpass what my dad accomplished," Bello said. "I want to go further and push to win it all. I think that that is everybody's objective, to improve what they have done before. If you set yourself to do it, you can succeed."
(With inputs from agencies.)