Dear past me:
At 15, you have zero idea about anything. It doesn't even get much better at 21. So express the viewpoints you do have carefully, and start listening to slowly form more substantiated opinions.
In addition, stay away from virtue-signalers. They know as little as you, and only care about appearing good while being an awful person in reality. Doing so, you may avoid interacting with two of the worst people you'll ever meet.
1 year