"Here's a list of all the things you should invest in over the next 15 years and when you should cash in those investments. Never get into modeling and - if you decide to ignore that advice - [blank] is a horrible agent who will SA you. [Blank 2] looks cute now, but same goes for him so when he shows interest in a relationship after 6 years of friendship? Hard pass. [Blank 3] whom you'll meet in college doesn't really need help, she needs a victim. Don't try to console her. This might not be relevant though as honestly the theatre/psychology double major will not amount in anything career-wise and will just stack up student loans which will push you back financially up to twice your age. Never trust [blank 4], [blank 5], [blank 6], or [blank 7], they're gonna offer you "jobs" but the contracts are extremely disfavorable and there's a reason their staff are all women... you've seen the pattern by now so you know where this is going. You'll see [blank 8] again after years, and she'll look just as cute, and be willing to give you another shot. Don't. It's a trap. She just wants to mooch off you and is willing to use sex to get there. Our relationship with mom, dad, and our siblings doesn't get any better; don't waste funds or time on that."
...I don't know if that would help, or if that'd convince my 15 year old self that there's nothing good to look forward to and speedtrack things.