Not at all - just the opposite. I believe God chose his elect for salvation in Christ before the beginning of time in his sole sovereignty and based on no works of their own. However, I believe scripture when it says those chosen, once regenerate, will repent of sin and sincerely work to live a life apart from it. That will be of upmost importance to them. Being human they will continue to sin but they won’t live a life of continuous or indiscriminate sin. When they do sin they will feel true remorse and confess it to God. They will sincerely work to eliminate that sin from their life. We don’t do this to earn our way into heaven but, rather, to show our sincere gratitude that we have been given eternal life. However if someone is unconcerned and indifferent to a persistent sin in their live (or even worse, if they work to rationalize or condone it) it is a powerful sign they are not regenerate. Pretty basic Reformed Theology
The Bible only requires that you call upon the Lord to be saved (Romans 10:13). YOU'RE adding "repentance" as a precondition for forgiveness and salvation. But true Bible salvation comes from receiving Jesus Christ alone, not some sort of man-made cleanup first.