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This is great advice. This is when you have the time and leisure to explore what you really want. Can't really do much else with teenage years.
Truth is, if you took a poll, you would probably find that most adults you know/respect found their teenage years the worst of their life. Mine certainly were. At 13 or so, we are biologically ready to choose a mate and start a family. Until recent (200 years?) history, people did not live much past 35 or 40. And people many times did not name babies until they were at least 2, in case they died. Our biology is still basically in that stage.
But you can use this time to explore who you really are, choose where you want to go, figure out what you want out of your life. You have a tremendous advantage, if you look at it this way. And school "friends" will turn out to be a minimal part of this, at most.
You are not likely to have very many true friends in your life; most people do not. As for social life, sorry, I see no particular value in it; it is a distraction. Not an evil thing, just worthless.