If you could turn back time to fix a mistake you made in the past, would you?

If you could turn back time and fix just one mistake in your life, what would it be and why would you change it? If you were able to travel back in time and fix a mistake, which one would you fix? How can you turn back time (within your life) to fix past mistakes? I wish I could go back in time and correct my mistake. Have you ever felt so or do you think that mistake was inevitable and it didn't matter much by committing that mistake? Do you wish to go back in time and change your mistakes? If you could go back in time to change a situation, or tell your past self something you wish you'd known sooner, would you? Why or why not?