Don't be ashamed your marriage ended. There are plenty of married and coupled people existing in unhappiness and toxicity. Why are you ashamed you let that dead weight go?
Relationships are not the barometer of happiness — your attitude and energy are. How you present yourself to the world single, coupled, or married is what shows if you are happy or not.
Being happy on your own leads to happiness with another happy individual. Just because this ended doesn't mean you can't be happy.