Why am I so jealous and what can I do to fix things?�?

I understand how you feel cause i was sort of like this in high school. I think everyone is capable of change it all just depends on how much effort they put into it, and the means they use to achieve it. Not everyone is the same, so i think you just have to find your own way to make that change. You seem to be very educated, reasonable, and able to recognize the problem at hand, so overcoming what seems to be insecurity should be obtainable to you. Anyways what helped for me is knowing what kind of person I'm with. I don't get involved with just anyone i take my time getting to know them so that i won't face this problem, Once trust is achieved then i will feel safe in having a relationship with such person. I'm sure you know there can be no relationship without trust. you might need to think and examine your reasons for anxiety. Obviously not everyone can let everyone else just fade into the background, and if you can't live with someone who can't do the same, then i might suggest looking for someone who can. I know it's not something you want to hear but if you truly trust him then there should be no reason for you to feel that way. I'm sure he isn't going to leave you for some random half naked chick in a commercial or another pretty face at a restaurant. I'm sorry if my answer wasn't the one you were looking for, but i believe you're afraid he'll leave you for these women; and one can speculate that it would be due a lack of trust in him... but you seem like a very logical person :) so maybe if you just step back and really examine the problem, then you will find your solution.