When you look back on your life, I hope you don't regret the mistakes you made but instead admire how much you learned from them. You didn't know then what you know now, so there's no point in labeling yourself as having been stupid or naive. In fact, you needed to be who you were and experience what you did to have the values, knowledge, and clarity that you do today. How badly you "messed up" isn't as important as the present-day evidence that you grew from what you went through. So please, stop holding the past against yourself when it's the very thing that shaped you into a higher version of yourself.