Every person in the history of the universe knows that.
Technically, you are a freshman. If your school year has ended, you can say you are a rising sophomore.
Regardless, you are spending too much time focusing on Stanford. Other than striving to do your best, it’s really to early to think of any specific colleges anyway. Get good grades, find some ECs you enjoy, prepare (when the time comes) for standardized testing. That’s all you can/should really do now. But know that one EC will not make or break an application, nor will a grade less than 100, nor will an SAT/ACT < 1600/36.