Tobey, I'm not really sure where to begin, so let me get this straight...
You're interested in a 17-year-old girl on Tinder. Red flag number one. Hang out with girls your age. It's better on all levels. Friendship is fine, but it's clear that's not what you're looking for.
You take selective advice from an internet message board that she's going to get dangerously clingy, and ignore advice that you're exhibiting some potentially predatory behavior. This is compounded upon every time you've ignored reasonable advice in favor of some weird solution you've rationalized in your head.
Your solution is to FAKE YOUR OWN DEATH. Never mind any fear you might cause to your family or friends, and never mind any trauma you might inflict upon this girl by suddenly "dying" after sticking it to her, maybe even after being her first, what's important is getting away clean by FAKING YOUR OWN DEATH.
This is all due to your completely nutsballs rationalization that she's crazy. Not you. Her. The 17-year-old girl who is interested in an older guy. Not the 22-year-old who is prepared to FAKE HIS OWN DEATH to get some underage pussy.
This is classic delusional behavior. Everybody else is crazy. Not you. The fact that we even need to explain to you why this is a series of completely awful ideas is clear enough that you are consistently making bad decisions. I say this with utmost sincerity that you should be looking for solutions in a therapist's office. Not Tinder.