When you pray are you asking God for HIS will or YOUR will? An example of this is would be, "God, I know what you have in store for me is best, but please make my parents let me go to the party tonight!" I must say I have caught myself doing this when I really want something. Now you may ask what is soooo wrong with this prayer. Asking God for His will and then asking Him for yours is wrong because God's will for your life is perfect. God designed your life and has a whole plan for it...you changing that doesn't work out the way God wants it too...and daddy knows best! Even though  sometimes we cant see how something the complete opposite of what you want is best for your life, we have to remember that God sees everything. He know the future, my way and His way. He knows if you will fail or succeed  Also, when you ask God for His will and your will it is kind of like saying you don't trust God cause you think your plan is better than His. Just put faith in God and always trust in Him. 1John 2:17
"And the world is passing away, and the lust of it; but he who does the will of God abides forever."