People are so alike in many ways especially in terms of expriences and feelings. No one has the monopoly of those in this world, so you can never say that other people don't know what you are going through because it just isn't true. The only difference there is, lies in the magnitude of those feelings and experiences.
It is for certain that most people have things and experiences in their lives that they want to change if only there is a way to do it. Sometimes this is the way I feel too. If only it is possible to go back to the time when I was still child, I would like to change some of the decisions I made back then so that ghosts wouldn't haunt me today and there would be no room for regrets. If only time machines and time travel were for real, I'd like to be the first to use it. But this is just not possible, it's all make-believe. To those who feel the same way as I do, what's true is here and now, you just have to make the best of what's before you now. It's no use hankering for what can never be and no use thinking of the what-could-have-beens, it will onlybring grief and frustrations.
Despite mistakes and blunders that you have done in the past, what counts is that you are still being given another chance in life in the path that's right before you now. Your past and my past is what makes us who we are today, it's what makes us unique. It adds depth to our character, making us more appreciative of things that are worthwhile and we know better than to dwell on shallow things. And now older and wiser, there won't be an excuse for making the same mistakes... choose wisely for who knows if there will yet be another chance after that.