I'm the same way! I used to be super jealous too. It's actually when I got depression that I stopped being jealous of other people (don't ask me how that works... I have no idea lol.. maybe it's because I realized how judgmental I had been before and that it's better to have compassion and empathy for other people rather than to criticize them [my criticism likely stemmed from my jealousy in some ways]).

Lately, I've been struggling with jealousy. It comes and it goes. I went through a period where I felt really like.. zen and was okay with everyone and everything and life was great. and then all of a sudden the largest episode of depression I've ever had came and it was like BOOM. My life fell apart. (It seemed to have snuck up on me, but I likely hadn't gotten over my first episode of depression, just managed to distract myself). My friends in the city stopped talking to me because they were too weirded out over my emotions (jerks). Now I see they still occasionally hang out with each other and their pictures or status updates tagging everyone on Facebook.. and that hurts.
And it's reasonable to feel hurt over something like that. But you can't dwell on that stuff.
I guess you just have to concentrate on what you have (like my new awesome job that is actually relevant to my BA!) rather than focusing on the past or areas in your life where you feel you may be lacking in some way...
It's just harder to do when you're used to thinking so negatively and critically of yourself. But I guess it's a process you learn.

Sorry I went on a bit of a rant! lol