“If it seems too good to be true it probably is…”
Do you often set very high, unrealistic expectations for yourself?
Ever noticed that when an event, a person or anything else does not meet the expectations you had you feel disappointed, upset or angry? Like the 2nd hand car salesman who sells you a pristine new car which lets you down, high expectations will do the same.
This is different to settings standards. By all means set high standards and stick to them, but expecting to those standards to be met by everyone and by yourself all the time may not be realistic.