existential crisis..

I think I've been suffering from an existential crisis since I graduated with my Masters more than a September ago...

I always had things to do - a job to go back to, a degree to earn or something to call my own.. now, I have nothing that I MUST do.. nothing that defines me, like my job had done for me since 1998 or my studies a couple of years ago.. I am no longer a manager, an engineer, an analyst, an executive nor a grad student...so who am I? what am I? what is the meaning of life, or more specifically what is the meaning of my life? why do I exist? Religion is unable to give me a convincing explanation, and the many scientific points of view are equally depressing..

I know that I am still me.. I know that I've definitely gained more knowledge (not just work/academic-centric but everything in general), more insights into how things/people work and also what make me tick (or not), more understanding of things outside my usual comfort zone and a couple more pounds :( in these past 4 years.. yet I am not able to reconcile what I've learned with what I'm supposed to do.. Life has become, at least now that I've the time to ponder upon this question, a big scary unknown..

I had the time to think about what I don't want to do - going back the humdrum banal life of an IT engineer.. I don't know what I am supposed to do with my life.. whether there is a higher purpose to my life.. if I've passed the "test" of life.. I know I can do so much more in life, yet I can't decide on one single "thing" to dedicate my life to.. in fact, I feel trapped and frustrated.. what is the use of gaining all these knowledge when I can't use them for the betterment of the society and the world?

I want to mean something to some people.. I want to be of importance or of value to my family and/or friends and if I can I want to leave my legacy to the future generations.. maybe literary or artistic creation(s), valuable and unique insight(s), applicable and pragmatic theories or any other beneficial gift(s).. I want to be remembered as someone who did good and made a difference..

I have several options to get myself out of this.. Reading helps.. especially Desiderata and this article.. so is understanding Frankl's Logotherapy and Satre's Existence precedes essence... but most importantly, I know I need a plan of action.. a plan to get myself out of all these.. a plan that I will need to execute soon..