Advice Corner | Failure

Hello,
I would like to seek your advice on my current situation. I feel like a
failure in life. Most of my friends got engaged, married or promoted
and I couldn't do any of these.
I feel like I missed something, I don't know what to do anymore or how
to be happy. Ever since university, I tried to study hard to get a good
job but I spend two years unemployed till i found one but my seniors
don't want to teach me anything they just tell me to adjust ms- word
documents or they explain something then I discover its wrong so they
can act like heroes and intervene to save the day and put me aside.
I spent 4 years studying electrical engineering to fill out ms-word
documents! 
I tried to find another job, but I couldn't get any. I reach the final stage
then they refuse me. My colleagues keeps getting promoted and travel
on the company expense and brag about getting extra money, all this
leaves me bitter.
I get extremely jealous when I hear about my friends or work
colleagues' accomplishments. At first, I used to be jealous then I was
able to move forward but recently I can't, I cry everyday and I can't
focus on anything anymore
I know that this is not productive but I can't help it. I feel very frustrated
and sad 
I just don't know what to do!