Alright kiddo, let me try to explain what "us" means.
Do you know how you have a family and you're a part of that family? Well, "us" is kind of like a big family, but instead of being related by blood, we're related by things we have in common.
For example, you might be part of an "us" if you love playing video games. That means other people who love playing video games are also part of that "us" group.
Sometimes "us" can also mean a group of people who live in the same place or have the same job. So if you go to school with a lot of kids, all of you are part of the "us" group of students.
The important thing to remember is that being part of an "us" means you have something in common with other people and you're all part of the same group. That can be really fun, because you get to share interests and experiences with other people who "get" you!