honestly, i think the best thing to do is to ignore facebook and those people.
i used to feel the same, i just got fed up of feeling inferior and stopped paying attention to them.
try to focus your energy into something else, don't give yourself time to check up on their profiles.

if you start an art project, or try learning an instrument (youtube tutorials, you can buy a keyboard for really cheap and teach yourself, it gets addictive in a good way!) or go gym and try to enhance your body then much of your attention will gravitate towards those goals.

don't worry about them, they have good lives in terms of socializing etc but most of them have no passion, having a passion and a dream really gives life a genuine purpose and makes you want to live and achieve it.