Don't dismiss this outright as the work of some raving lunatic. There's some sense to this story, if you'll just hear me out...
Look, we all wonder if time travel is possible, right? Well, let me tell you something... it is. I'm from the future, actually. It's a really great thing; getting to see the past, watching events unfold... stuff like that. We know more now than we ever would.
Behind all the fun, though, there's a more serious aspect. We aren't supposed to go in our own lifetime, and we are NEVER allowed to contact our past selves. Let me tell you, I'm breaking that rule right now. Yes, kid, you're talking to yourself. Your future self. I'm going to be executed for this, but you know what? I accept that. I'm preventing something by talking to you that's worse than death. I can't tell you outright what to do, because filters would catch it. This is the closes I can get, trust me. I can however send a little message.
You should probably read the first word of every paragraph, now.