“God is a spirit: and they that worship him must worship him in spirit and in truth.” 

John 4:24
“…and in truth.” Have you ever noticed how difficult it is to worship the Lord when you are living in contrast to his Word? 
If you are having a difficult time giving yourself over to worshipping God, ask the Lord to show you what in your life needs to be dealt with. Maybe you have been allowing yourself to believe a lie, maybe you are holding a grudge, maybe your priorities are out of line. Whatever the reason, make it right. God is worthy of your authentic worship and it is something you shouldn’t want to miss out on.