Your circumstances dont determine the quality of your life, how you think about the does.
If a skunk gets into the crawl space under your house, opening the windows and using the air freshner wont solve your problem. There are people who actually specialize in dealing with skunks. They are called "skunk whisperers" and its not cheap to have them come to your home.
But its worth it to get rid of the problem. How does all this relate to your thinking??
Simple: your feelings are odours and your bad thoughts are the skunk.
To change your feelings , you must get to the source and deal
with the thing that produce them.
How you think and eventually all these thoughts become so automatic like a lingering skunk odour- thought produce feelings, not the other way round.
Worried people tend to think anxious thoughts and eventually those thoughts are the skunk.
You stop noticing and learn to live with it. You get used to "stinking thinking" your thought pattern become so habitual as brushing your teeth.
You get so accustomed to thinking bitter, anxious, selfish thought that you stop paying attention
Take a step today and change the way you think, make consvious efforts to deal with your mental pictures.