Many Christians fear at times that they cannot pray. Sometimes this results from a sense of unworthiness. Other times it is due to our own lack of assurance or of cooled spiritual affections in our hearts. I hope that you find encouragement from the sound advice of Henry Scudder:
“Do not say, I cannot pray, until God hath given me grace and ability to pray; but, having an express commandment of God to pray, you must set about it, assay to pray as well as you can, desiring and expecting grace from him to enable you to pray; for God doth not usually let us feel the strength of his grace requisite to the performance of a good duty, till that out of conscience of obeying the command, we craving his help, do set about the doing of it” (A Key of Heaven, 62).