It's human nature to do something as well as you can. It makes you feel worthwhile, elevates you in the eyes of friends, family and work colleagues. But if you feel you have to do things absolutely perfectly, and second best just won't do, then you could be setting yourself up for failure – and the depression and anxiety that follows. 

Perfectionism is a common character trait, particularly in people in environments where there's fierce competition or a culture of bullying – some corporate cultures, and in some schools where there a strong emphasis on status and achievement. It's also common in people who come from families where the parents are authoritarian and love is conditional – given out as a reward for good behaviour or withdrawn as a punishment. A mild degree of perfectionism can be a healthy thing. It can drive you to achieve things you wouldn't otherwise achieve and it can give you the motivation to persevere in the face of discouragement and obstacles. High-achieving athletes, scientists, and artists often show signs of perfectionism. But it can also be a source of stress, anxiety and depression. 

So when does perfectionism become more than a useful character trait and becomes destructive? Warning signs are when you:
1. Worry about mistakes and don't give yourself credit for your successes;
2. Can't enjoy something you've done, because there are other things you need to do at which you might fail;
3. Regret things you've done in the past that haven't turned out as you'd have liked;
4. Frequently criticise and find fault in others;
5. Have trouble adapting when circumstances change or when you aren't able to control a situation.