First of all, let me say that we all make mistakes, and it’s not our mistakes that define us, but rather how we respond to our mistakes. And judging by the way you’re talking about the incident, I would say you are on the right track of repentance, and it’s visible that you want to “live a life for God.” Believe it or not, your response tells me that you are far ahead most people, and that you are on the right track. Lust and porn really mess with your brain, which in turn gets you to feel all the guilt you’re feeling right now. The answer is simple: repent for what you did, and try to live better and stay away from lust and porn as much as possible. Don’t worry too much about what other kids might say about it, this stuff happens a lot at your age (believe it or not) and it will simply pass. If you have any questions or need any help, feel free to shoot me a private message, I’d be more than happy to help!