What is ENVY?

Of all the 7 sins I grapple with, the most intriguing one for is envy..there's lust(my no 1), wrath(a close 2nd),gluttony(not anymore,maybe my pandaaram cousins),sloth(yah,occasional),greed(hmm..) and pride(maybe..not sure)..

I am sure i would have gone through the 6 before at any point of time..the only time i felt greedy abt something was still,food..which led to gluttony,and the excees pounds I have since trying to lose...as for pride, my 1st real job's 1st month salary, i blew you on a Mont Blanc pen,thinking that i can finally be showing off,yield so much of emtyiness..but it's a helluva writing instrument so no real regrets really(i've lost it since and the person who took it,God bless)

But this thing ENVY..what does it feel like to be envious? i understand that it can lead to bitterness..so how does it feel really? The last time i used the word envy was to my friend,who recently lost his dad. I told him i envied his relationship with his father,something i don't have..the feeling was sadness..didn't feel bitter..so is that envy?

I asked one of my friends who's good in English..Jealous and Envy have different meaning..that's why they say jealous lovers and not envious lovers. Does envy lead to being ambitious and being competitive?

This is what the wikipedia says:
Envy is an emotion that "occurs when a person lacks another’s superior quality, achievement, or possession and either desires it or wishes that the other lacked it."^[1] At the core of envy seems to be an upward social comparison that threatens a person's self-esteem: another person has something that the envier considers to be important to have. However, what is envied could also be something that is only of personal importance to the envier, even if what the other person has is of little significance in his or her society, or even seen as a sign of inferior status. If the other person is perceived to be similar to the envier, the aroused envy will be particularly intense, because it signals to the envier that it just as well could have been him or her who had the desired object. .

The word jealous is often used to describe an envious state. In its correct usage, jealousy is the fear of losing something to another person (a loved one in the prototypical form), while envy is the pain or frustration caused by another person having something that one does not have oneself.

It still doesn't explain what emotions one will go thru..anyone out there with an explanation,welcome to do so