Hi son,
If you are reading this, it means that, you are 13 years old now. And I am writing this note to you because, I don’t want you to make the same mistakes that I did when I was 13 years old (at least for now). Try to make friends as possible as you can. I didn’t, that’s why I’m a bit lonely right now except for a few of my friends but, I hope you would be better. If you want, you can get a new hobby. When I was your age, I was solving some Rubik’s cube and I will not lie, I was so famous. Everyone was always coming to me when they had a scrambled cube. But this was sometimes a bit bad or hard because sometimes, you can’t do anything you want when there are a lot of people next to you. Whatever. And lastly, study for your exams. I studied so hard. Yeah, I know it’s not a mistake, but I just wanted to add here.
Love you son.
Take care
Your Dad