Personal boundaries are the physical, emotional and mental limits we establish to protect ourselves from being manipulated, used, or violated by others. They allow us to separate who we are, and what we think and feel, from the thoughts and feelings of others. Their presence helps us express ourselves as the unique individuals we are, while we acknowledge the same in others.
Know that you have a right to personal boundaries. You not only have the right, but you must take responsibility for how you allow others to treat you. Your boundaries act as filters permitting what is acceptable in your life and what is not. If you don't have boundaries that protect and define you, as in a strong sense of identity, you tend to derive your sense of worth from others. To avoid this situation, set clear and decisive limits so that others will respect them, then be willing to do whatever it takes to enforce them. Interestingly, it's been shown that those who have weak boundaries themselves tend to violate the boundaries of others.