You not only have to forgive others, you also have to forgive yourself! It's hard sometimes to forgive yourself for missing it and failing, isn't it? But you have to do it if you want your faith and prayers to work!

If you don't forgive yourself, it can keep you from receiving healing, and it can keep your prayers from being answered because your faith won't work except by love.

If you don't forgive yourself, it will hinder your faith just as much as unforgiveness toward another person will hinder your faith. It's just as wrong not to forgive yourself and to harbor ill will and animosity against yourself as it is not to forgive someone else.
My little children, let us not love in word, neither in tongue; but in deed and in truth. And hereby we know that we are of the truth, and shall assure our hearts before him. FOR IF OUR HEART CONDEMN US, God is greater than our heart, and knoweth all things. Beloved, IF OUR HEART CONDEMN US NOT, THEN HAVE WE CONFIDENCE TOWARD GOD.
(1 John 3:18-21)
You see, if you harbor unforgiveness and ill will in your heart, your heart will condemn you, and you won't be able to come boldly before God to get your petitions answered. Your prayers will be hindered.

But if you walk in love, your heart won't condemn you. If you'll forgive—not only others, but forgive yourself—your heart will not condemn you. Then you will have confidence in coming before God in prayer.

You know yourself that sometimes when you come into the Presence of God to pray, the devil will bring all kinds of accusations against you to try to keep you from praying. And invariably he will bring up your past to try to hinder you and keep you from receiving what you need from God.

When the devil accuses you of past failures, he's just bringing a photo into your mind—a picture—of your past, because if you've asked God to forgive you, your past sins don't exist anymore.

God said that He blotted out your sins. If God blotted them out, then they don't exist anymore.

Source: Love—The Way to Victory by Kenneth E. Hagin
Excerpt permission granted by Faith Library Publications