"It has been an insecurity of mine all my life. This guy I kissed (in middle school) was like, 'Your lips are really small but you're a really good kisser. I didn't think you were gonna be good at kissing'. It was so rude," Kylie told Complex magazine, reports femalefirst.co.uk.
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"From then on, I just felt like I saw guys staring at my lips. I felt like no one wanted to kiss me," she added.
The 19-year-old star, however, feels she went too far with the treatments.
"When you first get them done, you're like, 'Oh, it could be a little bit bigger on that side.' I'd go back and be like, 'They went down' and think they could be bigger. But I went too far. It was very painful," she said.
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Kylie initially denied having the treatments because she didn't want to be thought of as a bad role model.
She said: "I wasn't even 17 yet. What if I came out and said, 'Oh, yeah, I got my lips done'? What are all those moms going to think about me? These kids, my fans, they're going to think I'm crazy. I didn't want to be a bad influence.
"I didn't want people to think you had to get your lips done to feel good about yourself. But they thought it was crazier that I was lying about it because it was so obvious. I wish I had just been honest and upfront."
IANS