Some of the reasons why you are your own worst enemy:

Check this list to see if you have any of these signs that indicate that the problem is none other than you and no one else.
1. You always seem to have difficulty managing your expectations.
2. You always fail to appreciate the smaller things in life.
3. You take almost all the things for granted.
4. You are mostly your own worst critic.
5. You tend to over analyze the situation.
6. You tend to prefer the easy way to situations.
7. You seem to doubt yourself in most situations.