Replying from a personal perspective, as I myself has gone through your situation.

1. Quit Facebook, its of no good. Why do you want to live in a virtual world, when you have so much to see and explore in the real world? Also, I connect with people on a personal one-to-one level, where I can listen to there stories of hardships and tribulations, before they reached the top of the mountain. That is much more fascinating, than browsing through pictures/status update and making bizarre assumptions and eventually compare and belittle myself.

2. Life is not a race, we are here to learn and experience lessons, to become the greatest version of ourselves, not to live somebody else’s life. Stop comparing, you will always be shortchanged…………… because we only see people’s glory through social networking sites, we never come to know the stories behind it.

3. Concentrate on your skills and knowledge, brush it up everyday and fine tune it. Even if you clean toilets, do it to the best of your abilities. You have a doctoral degree, why do you feel inferior to others? Think of those who cannot have any education, even if they desire it dearly.

4. If you wanna compare yourself to others, compare yourselves to the less fortunate. Be thankful, you have your parents, your education, a place to live, all basic amenities i.e. water, food, clothing, etc. Now carry on with this list.

5. Above all be your own best friend. Whenever you seek any answer or have a query in life, answer yourself as you would have to your best friend? How would you have reacted if they asked you the above question? Would you have asserted in a positive/negative tone? So, why speak negative to yourself. Always use strong powerful positive words, they in turn will create your thought, which will create an action and eventually a feeling of hopelessness or purposefulness.

Love and Blessings.
P.S. Be present, train your mind to be here and now, rather than in the past or future. Its a moment to moment decision.