Your beliefs create your reality. If you believe you are unworthy, guilty, incapable, those beliefs create a pattern which can eventually be reproduced in your body. Taking time to relax and center yourself, to know that God loves you just as you are, is essential for your well being. The best medical care in the world cannot overcome a mindset which is focused on weaknesses. Meditation is a way to improve your spiritual attitude.
Meditation can be as undisciplined as daydreaming.
There are many ways to meditate. Some are more structured and disciplined. Others are less structured, and can be as simple as sitting quietly and breathing slowly and evenly, allowing your thoughts to become still. Meditation can be as simple as taking a few moments to slow down, go within and reconnect with your spiritual source. Find a form of meditation which works for you and is comfortable for your beliefs and lifestyle.