Recently I began reading a book that made me realize this approach may be more flawed than I originally realized. I don't think it's the action itself that makes it what would call "selfish" but the lack of discussion of how to react when the prayer is answered. I failed to include this important part of the post.
Too often I feel that many of my prayers are more like the wish lists that we come up with as children- lots of requests...then, when the gifts come, we are usually too swept up in the moment to really express proper gratitude for them. Sometimes I focus too much on what I want (or need) from God and fail to recognize the things I'm being given. And if I do receive what I am asking for, I'm afraid to say that I feel that my reaction is often underwhelming to God.
God, more than any giver of gifts, deserves to see your joy upon receiving what you requested. God deserves praise for delivering. God desires to share in your joy/relief/contentment. Don't deny this portion of your prayer life- allow your prayers to express the gratitude more than usual this week and in the future.
"I will praise the LORD, who counsels me; even at night my heart instructs me." Psalm 16:7