Well, If they ever do anything to ever completely piss you off and you're ready for the consequences, you could tell them exactly what you wrote in this question.
For the admissions thing, show them the entering class profile statistics versus your own and if they see you weren't in their Average or above range, they'll probably lay off on going to an Ivy league school (which let's face it, Those are completely ridiculous to apply to...I had a 33 ACT, a 4.3 GPA, and was 17th in a class of 676 and had a butt-load of extra-curriculars ....and knew there was almost no point in applying to an Ivy League... they cost more for the reputation, but are more or less educationally equivalent to a Tier 1 school (as ranked by US News&World Report) that has a "good program" for your major.)
Socializing? Tell them you're not 5. They don't pick your friends anymore. It sounds like they're trying to live vicariously through you.
Other than that, idk? Point out when you do well on a test where nearly everyone failed, other achievements, etc? Maybe they'll start to realize their daughter is doing a much better job than they did at the same age.