The June LSAT is coming up in 17 days. You may well be freaking out right now about whether you’ll be ready by then. That’s normal. It also does you no good.
The official deadline to change your test date has come and gone. You still have a chance to get out if you need to, though. You can withdraw your LSAT registration up until the night before the test, if you’re compelled to. If you do, law schools won’t even know you were registered for the test.