In her documentary, "My Mind and Me," the 30-year-old actor shared details of her ongoing health difficulties.
Selena, who has battled melancholy and anxiety, is heard saying in a clip from the film, "Just be who you are Selena. Your actions are unimportant to anyone. It's about accepting who I am and where I am. I'm happy to be alive.
Selena, who underwent a kidney transplant in 2017 after being diagnosed with lupus, first gained notoriety on "Barney and Friends" when she was a young girl.
In spite of her desire to avoid being "very famous," Selena is determined to utilise her platform to promote kindness.
In the clip, she explains, "I've worked my whole life, ever since I was a child. Although I don't want to be incredibly well-known, I am aware that if I am, I must make the most of my presence.
Selena has always struggled with self-confidence despite her popularity and fame.
The singer of the hit song "Lose You to Love Me" said, "That I'm not good enough. I experienced a lot of that as I was growing up.
Selena, on the other hand, admitted earlier this year that she previously experienced over-sexualization when taking pictures for an album cover.
The top-charting artist feels that throughout the session, she was placed in a "unfair" situation.
"I actually did an album cover, and I was so mortified after I finished it," Selena admitted.
"I had to get through those emotions because I realised they were linked to a more serious issue that was occurring. I didn't necessarily enjoy my decision, but I believe I gave it my best effort and made an effort to be myself.