Why with all the individuality and uniqueness of each one of us do we feel compelled to use formulas to pray? Does God create us with such complexity and detail to only hear us if we include all the aspects of a respective acronym? I don't believe so.
From the very beginning, Adam had normal conversations with God, as normal as could be expected anyway! After the fall, this openness had certainly changed. To try to sum it up, the Old Testament from Moses on, shows the unattainable perfection God required in order to approach him, however, it is also shown that His mercy and grace covered those who tried but ultimately failed. Finally Jesus opens this line of communication so we can confidently approach the Throne of Grace with everything we are.
Jesus's ministry was so broad that I won't begin to dissect it completely, but one thing I want to point out is that He was very clear that the method was much less important, if important at all, in comparison to the heart. He talked about the Pharisee and the Tax Collector in Luke 18:10-14. The Pharisee talks about all he does, but the tax collector simply begs God for mercy. Jesus is clear about who is justified.
Those who are fans of formula like to point out the prayer Jesus gives when the disciples ask Him how to pray. Without any kind of degree in theology, I'd like to offer my simple view of what Jesus was doing here. One point could be stated that disciples of teachers often had specific, special prayers that their Rabbi would compose just for them. This is why Jesus's disciples compare themselves to John the Baptist's disciples (Luke 11). Jesus also knew the limits of our humanity, and how we often need guidelines to help us get started.
If you know me at all, you know that I thrive most in an environment of rules; of boxes to check. In one way, I really love the idea of having specific prayer points to include. It helps me to focus on the fact that I am speaking to the Lord of the Universe, not my pocket genie. I do notice, however, that whenever I try to implement a formula to my prayers, it becomes fabricated and forced. In time, the guideline becomes restrictive and all I really want to do is quit. This is just me. It may not be this way for others.
So if you feel unable, or just unsure of how to talk to God, just open your hands to Him. Lift the cries of your heart, as unique as your fingerprints, up to Jesus.