When Demi Lovato performed at the 2020 Grammy Awards, it was the first time she'd been on stage in over a year and half

Demi Lovato feels grateful to be able to use her voice following her near-fatal 2018 drug overdose.

In her CBS Sunday Morning interview, Lovato opened up about her emotional performance at the 2020 Grammy Awards, which was the first time she'd been on stage in over a year and a half.  

After singing the first few lyrics of her song "Anyone" — which was written before her overdose, and will be featured on her upcoming album — the singer, 28, became so overwhelmed with emotion that she had to stop. After starting over again, the singer passionately belted her way through the track, receiving a standing ovation from the crowd.

Asked what was going through her head at the start of the performance, Lovato recalled the enormity of the moment.

"I didn't know if I'd ever step foot on a stage again. When I woke up at the hospital and I was like, 'I don't know the full extent of the damage that's been done,' " she said. "I hadn't tried singing yet."

Since then she has performed multiple times including the debut performance of her political anthem "Commander in Chief" at the 2020 Billboard Music Awards last October and her rendition of Bill Withers's "Lovely Day" at President Joe Biden's virtual inauguration celebration.

Demi Lovato
Demi Lovato
| Credit: CBS Sunday Morning/YouTube

Speaking about her overdose during the interview, Lovato said she is "grateful" to still be alive as she almost didn't make it through the harrowing experience.

"The doctors told me that I had five to 10 minutes and … like, if no one had found me, then I wouldn't be here," she said.

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Now, the star is more "in control" of her life — and feels "more joy" than ever before.  

"I feel so good. I feel more joy in my life than I've ever felt because I'm not quitting or diminishing any part of myself," she said. "I think that my whole life I was the horse that everyone was leading to the well and they couldn't make me drink the water from the well. I wasn't until this past year that I was able to taste the freedom of the water in the well because I finally was ready to drink it." 

Lovato told PEOPLE during a Television Critics Association panel last month that she "wouldn't change a thing" about what happened after her drug overdose.

"Everything had to happen in order for me to learn the lessons that I learned," she said. "It was a painful journey, and I look back and sometimes I get sad when I think of the pain that I had to endure to overcome what I have, but I don't regret anything."

"I'm so proud of the person I am today," she added. "And I'm so proud that people get to see it in this documentary and I couldn't be more grateful that I had someone by my side."

If you or someone you know is struggling with addiction, please contact the SAMHSA substance abuse helpline at 1-800-662-HELP.