How many of you look back and say, "I can't believe I did that back when I was a teen, or young adult"? I do. Every day! That is until I stop and remember that when I was young I had yet to take responsibility for my actions. As I grew older and more mature I have realized that many of the things I did I forgot to stop and think through the situations to see the possible results. I still do that on occasion, but not as often as I did in the past.
As we become God's children and are forgiven by God it includes everything we have ever done in the past. (Wow, what a relief) However, it doesn't change the way people in our past may see us. I believe that if we give ourselves time and have opportunity to live a life that says, "I want to apologize for what I have done in the past." That is what we do when we become God's children. We ask forgiveness from the God we have hurt with our actions.
If we are Christians and do something that hurts others in our lives or those who may see us fail as Christians, we need to realize we can not undo an action or un-speak a word.
What we can do is ask forgiveness and when given the opportunity to say "I'm sorry", take it. Say it! "I'm sorry for what I have done in the past to you."
It is not difficult, it is just a decision. Just ask forgiveness when you realize that you messed up. Then, realize and believe that God has forgiven you. Let evil know you aren't going to be held in its grasp.
God bless you through your walk!