The shortest answer I can give is that if you do not feel like praying, that is the time you really need to pray!  Is there a reason why a believer would not want to communicate with the Lord?  It is a wonderful privilege we have to know that when we address the Lord, He listens.  When we go to Him with our cares and worries, He listens.  When we go to Him on behalf of others in need, He listens.  When we offer Him thanksgiving and praise (no matter how feeble), He listens. 

King David committed himself to prayer.  He wrote in Psalm 55:17, “Evening, and morning, and at noon, will I pray, and cry aloud: and he shall hear my voice.”  He committed to speak to the Lord all day with the confidence that the Lord will listen! 

Perhaps it is shame that would make you hesitant to talk to the Lord.  Perhaps you have been involved in some ungodly behavior and you are now embarrassed to be in the presence of the Lord.  Perhaps, even though you realize your need of the Lord, you have gotten away from Him and feel awkward in his presence.  These are things that a believer should not do, but if you have, you can simply confess this sin to the Lord with a repentant heart and receive His complete forgiveness and restoration.  We read in 1 John 1:9, “If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.” 

Speaking of one in need, the Lord says in Exodus 22:27, “…and it shall come to pass, when he crieth unto me, that I will hear; for I am gracious.”  What a precious promise!  The Lord wants us to constantly be in the spirit of prayer for He tells us in 1 Thessalonians 5:17, “Pray without ceasing.”  He wants to hear from us.  Then, we have these words of assurance in 1 John 5:14, “And this is the confidence that we have in him, that, if we ask any thing according to his will, he heareth us.”  When we ask anything that is in accordance to God’s holy will, He will answer!  Of course, we really do not want anything that is not according to God’s holy will.  For the believer, we trust the will of God and want the things He wants us to have. 

Psalm 37:4 teaches us, “Delight thyself also in the LORD; and he shall give thee the desires of thine heart.”  When we truly find our delight in the Lord, He changes the things we desire.  We desire to please Him, to honor Him, to serve Him, to worship Him.  We do not want anything that might be a hindrance or distraction in our relationship with Him.  When we delight in Him, the things we ask of Him will be according to His will and He will “give thee the desires of thine heart.”

I want to draw your attention to one more verse concerning prayer.  Romans 8:26 tells us, “Likewise the Spirit also helpeth our infirmities: for we know not what we should pray for as we ought: but the Spirit itself maketh intercession for us with groanings which cannot be uttered.”  We sometimes do not pray because we do not know what to pray for or feel we don’t know how to pray properly.  The Lord tells us here that when that happens the Holy Spirit will intercede on our behalf and lead us into a proper prayer to the Lord.  As you have admitted here that you do not feel like praying, I suggest that you admit that to the Lord and allow Him to fill your heart with His love and presence and then I believe the prayers will flow from your heart to His.  (431.2)