I understand where you are coming from. In the past I have wondered why other people always seemed content in prayer and I had a difficult time doing so. What helped me get a better grasp on things was really studying and examining the Lord's Prayer as Jesus told his disciples.
Mt 6:9-13
9 After this manner therefore pray ye: Our Father which art in heaven, Hallowed be thy name.
10 Thy kingdom come. Thy will be done in earth, as it is in heaven.
11 Give us this day our daily bread.
12 And forgive us our debts, as we forgive our debtors.
13 And lead us not into temptation, but deliver us from evil: For thine is the kingdom, and the power, and the glory, for ever. Amen.
After this manner therefore pray ye:
This prayer is certainly not the only thing you can pray, but we are to pray after this manner. In other words, Jesus told his disciples to use this as a general example.
Our Father which art in heaven,
Rom 8:11-17, Gal 4:1-7, Heb 10:14-22
Hallowed be thy name.
Ex 6:3, Ps 83:18
Thy kingdom come.
Mt 24:29-36, Rev 19:11-20:25
Thy will be done in earth, as it is in heaven.
Lk 9:23, Jn 15:1-14, Mk 12:29-31, Mt 28:18-20, Mt 7:12
Give us this day our daily bread.
Mt 6:24-34, Lk 12:22-32, Jn 6:27-51, Mt 4:4, Phil 4:6-7
And forgive us our debts, as we forgive our debtors.
Mt 6:14-15, Mt 18:21-35, Lk 6:27-38
And lead us not into temptation, but deliver us from evil:
Gal 5:14-26, Eph 5:1-11, Phil 4:8-9, Col 1:9-22, 1 Cor 10:1-14
For thine is the kingdom, and the power, and the glory, for ever. Amen.
Gen 1:1, Ex 20:1-7, Isa 6:1-3, Jn 1:1-3, Rev 19:11-20:15
You can also find this prayer in Luke 11:1-4. The list of cross references is from my own personal study. There are undoubtedly more, there are probably better ones, but this should be sufficient to get you started and give you a good scriptural basis expounding this prayer.
This study helped me tremendously because I no longer focused upon my shortcomings and unworthiness, but focus on my status as a son of God. I have been born again of the Spirit of God; I have been made a new creature in Christ and can enter into the Holiest of Holies with bold confidence. I remember and pray that the name of the Almighty God, which is Jehovah, is holy and ought to remain that way. I remember that Jesus is coming back, that God is not finished yet and His kingdom is coming - and I pray it comes quickly. I remember that I am a stranger here, and my purpose is not to amass wealth or worldly pleasure but to do the will of the Father; I pray for strength and courage and wisdom to love others as myself and spread the gospel of Christ. I remember that I am completely dependent upon God for my provisions, I have not done nor can I do anything of mine own self. I pray for bread, both the physical nourishment and spiritual bread which is the word. I ask for forgiveness, and remember to forgive others as commanded: even as the Father has forgiven my miserable self through His Son. I ask that the Holy Ghost keep me from giving into the flesh, I ask that I may be kept in Gods hand and separate from this world, I ask to be delivered from evil and for the ability to walk a righteous life approved by God. I praise God, for His is the kingdom, glory, and power for ever. Even though God knows my thoughts and needs, I make my personal requests known to him believing in faith, knowing that whatever I ask in the blessed name of Jesus will be given unto me.
I hope this can be of good use to you, that it kindles the flame inside you to really study the inspired word of God and to believe what it says. If you study the Lords Prayer and truly understand it soon prayer will become a natural thing. Know that while there is nothing wrong with long prayer, long prayer itself should not be your goal. Speaking to the Father should be the desire of your heart, whether that conversation is long or short.