Losing Interest in Devotions

As I've gotten more active in serving God, I've been shocked at how quickly I've lost interest in doing personal devotions. For some reason, my flesh is convinced that it's much more fun to serve God than to just be with Him. People in romantic relationships often feel that though it's fun to go to parties or whatever with their loved one, the best times are when they can be alone. Yet with God, the opposite seems to be true. I used to think I avoided facing God because of some sin I didn't want to give up, but I don't think that's completely true. Maybe I think of some sin to use as an excuse for why I'm avoiding devotions, but there's something more that keeps me away from God. I think it's so easy to stop looking up and start looking around. I wrote before that I've seen how easy it is to start taking credit for gifts, but it's also easy to get selfish about serving. It's easy to want to help because I don't want to see suffering, or because I want to have a feeling of fulfillment. Such sneaky ways to take my eyes off God! But whatever the reason, the moment it becomes about me I lose interest in being with God.
However, when I start working for myself, I lose everything! I lose God, and I lose the fulfillment that only He can give. Suddenly, it has become obvious to me why I feel my strength runs out. God's love, power, strength, etc is endless, but I have to stay near the supply. True, sometimes I want to do things in my own strength for the glory or whatever, but there are other times that I want to do things in God's strength, but I feel it isn't enough. It's because I move away from the source. I start looking around and forget to look up... until I get exhausted and depressed and begin to wonder what went wrong.