You asked: "Why should I worship, pray and meditate?" These are good and valid questions, and I am offering a few Urantia Book passages and links that may help you to identify these practices and also to discover their values.
These are but a few Urantia Book quotes regarding prayer, worship and meditation. Please see
Man can never wisely decide temporal issues or transcend the selfishness of personal interests unless he meditates in the presence of the sovereignty of God and reckons with the realities of divine meanings and spiritual values. The Urantia Book, (99:7.4)
Meditation makes the contact of mind with spirit; relaxation determines the capacity for spiritual receptivity. And this interchange of strength for weakness, courage for fear, the will of God for the mind of self, constitutes worship. The Urantia Book, (160:3.1)
One of the great troubles with modern life is that man thinks he is too busy to find time for spiritual meditation and religious devotion. The Urantia Book, (195:6.7)
Thanks again for this important question. I hope that my reply is helpful.