Have you ever considered how you came to love what you love? Think about it. Your life is filled with love for people, places, and practices. In his book, You Are What You Love, James K. A. Smith says that "love is a habit" (p. 32). He argues that we love what we have practiced loving.
By way of example, I love to run, but this wasn't always the case. In fact, I don't believe I ran a mile before I was 25. Now, I run 5x per week, so why the change? Smith would argue that new habits formed new loves. One day, I ran 1/4 mile. The next day 1/2 mile. The next day 3/4, and so on. Here's the thing, most of this was miserable. But eventually, a new habit was formed and I could see and feel the changes this new habit had on my life. I developed a love for running through the discipline of running.
Think about the amazing application to the Christian life (especially our times of corporate worship). Disciplines give birth to habits, which give birth to loves. Smith continues,
"The church - the body of Christ - is the place where God invites us to renew our loves, reorient our desires, and retrain our appetites. Indeed, isn't the church where we are nourished by the Word, where we 'eat the Word' and receive the bread of life? The church is that household where the Spirit feeds us what we need and where, by his grace, we become a people who desire him above all else. Christian worshipis the feast where we acquire new hungers - for God and for what God desires - and are then sent into his creation to act accordingly" (p. 65).
When you attend our worship services on the weekend, let me encourage you to come expecting God to renew, reorient, and retrain you. It is in this setting, when we're gathered, that God feeds us, comforts us, reminds us of his promises, gives grace, and sends us out on mission. But, what if you and I don't "feel like it (singing, praying, etc)" today? Then what?
When you don't feel like engaging, engage. When you don't feel like singing, sing. Why? Because God is more pleased with you? Never. Engage and sing even if, and especially when you don't feel like it, because God uses these means to create new loves. You just might find, in short time, that God used the discipline to create and awaken new desire.