Good, Jeremy!
Your heart is definitely not hardened.
God is far more merciful than we know!
I think he knows what weak humans we are and allows for our shortcomings, as long as our heart is in the right place.
He says he wants us to live, That is his purpose, to have our sincerity, love and worship.
He wants to reward us, not condemn us.
Jeremy, there is no doubt your heart is in the right place.
Please stop worrying and relax and accept God's forgiveness with a thankful heart.
Now, go on and live your life for God, and stop with the worrying.
God is looking down upon you with so much love and admiration for your repentant heart.