Personal boundaries help you enjoy healthy relationships and attract people who are positive forces in your life and build your self-worth. Personal boundaries factor into creating a rich, fulfilling life that keeps you in control of your destiny.
Personal boundaries are defined in part by knowing when to say "no" and not feeling guilty about it. You are not expected to do everything anyone asks of you.
Healthy personal boundaries are based on your own moral beliefs. Going against your values for another person means that you may want to reassess your relationship with him.
Personal boundaries can help you form your identity because they force you to evaluate what you want and what you don't want in your life, and enforce those guidelines.
When others cross your personal boundaries, tell them. You don't have to fight with them to let them know where you stand, but calmly talking about your boundaries enforces your sense of self and purpose.
Above all, don't let others tell you that your personal boundaries are unacceptable. They do not live in your skin. You know what you need better than anyone else.