My suggestion is:
forget how your other friend perform..
some of your friend might be starting family,
some might drive big cars...
some already a millionaire...

but that shouldn't make you upset...

You can definitely live a happy life without your existing gf..
she looks like wanted to change....
let her go...one day she will find that you are the Mr. Right...

2. To increase income, try to do extra job on weekend...

3. to feel less stress, try to help those who are less fortunate than u or me... direct your focus to other area....

lastly, can visit my post on Life like sunflower....
http://unlimitedkent.blogspot.com/2009/02/...-sunflower.html