Describe a time you failed and learned from it and how did you think about failure?

One time that I seen that I have had been hopeless and felt that I failed was when my parents found out that I used drugs. I never wanted to tell my parents I smoked and that it was becoming a habit. I can say it was a day where I just didn't want them to know and I felt like I had let them down. My parents always give me everything but their was things that I was going trough in some times that I didn't think about my actions. I haven't stop at this moment of life because I use it just so that I can sleep because I can't sleep in the nights and that helps me just relax. I just think that I keep failing my parents over time but as I get older I learn different things. I think that failure comes in different ways. I also know that some people learn from some of those failures but some don't. Its all about how you see it and deal with it.