Title: I am not ashamed of the gospel
We should rather be ashamed of ourselves because of the gospel.
The gospel is the good news on the sacrifice in righteousness, which we did not possess, and was put into effect in our lives by grace through faith, which we did not possess either.
The final sacrifice on the cross by the Lord Jesus has conquered all shame and fear, and would not disappoint of the hope that all that has been promised will be fulfilled, even eternal life.