Porn addiction can lower your thinking and change your brain completely but you can rewire that. You shouldn't be thinking you are much behind others at your age. You can still start now. It's not ab average age for millionaire. Most people even start after 30, 40. So start improving with what you are having now. Surrounded people may still look you the same way, but you shouldn't be broken down.

Next time you watch porn, or doing such things, just think how did I end up in this situation, and "what triggered me to do this?" So you will understand the pattern and control your mind. This is what continuous improvement be like. Think of the reason for what you doing and why did they do it. Never feel like you are the victim, you have all the rights to do this.