this. it's absolutely true.
pick 2 and do those 2 as well as you possibly can. for me it's 1. school and 2. work. i would recommend you do the same. school will determine the rest of your life, and to anyone preparing to say GPA doesn't matter - save it. it matters for the jobs that really matter.
you have your whole life to be social, work hard now, play hard the rest of your life while everybody envies your success.