Im jealous of my friends in facebook?

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I actually just want to share about this.. i have a lot of friends in FB and honestly, im pretty jealous seeing them enjoying their life, hanging out with their friends and doing all sort of things. Im an engineer and people say that engineer life is boring..well for me, im a quite active person and i enjoy the work that im doing now. But still, i feel jealous of the things my friends posted in FB and im thinking why i cannot enjoy my life more like them?? this especially hurt my feelings a bit when i see my ex gf posted somthing intresting with her bf..Do any other people experience this things or it is just me who face it?? Anyone care to share??