Warning: I'm completely incapable of keeping my responses to hypothetical questions neat and clear. I need to follow the consequences of the question to their conclusion, no matter how nonsensical.
It depends on what you mean. If it's time travel as in "you travel back in time", then no. I don't think there's anything I would like to say to past me or anyone else, and I wouldn't want to risk a paradox. It would only be for leisure, like experiencing some natural wonders before it disappears. I would probably re-experience the east of my country before it disappeared under a dam lake in 2006 (since I don't have teleportation powers to go with the time travel).
If it's about reversing time, so that I'm back in the me body at some previous point in time, then yes, I would. I actually discussed this topic with another forum member last year. First off, whether I could travel back in time, change one thing, and then travel back forward, or whether I would travel back in time, and then live the rest of my life (till my current age and beyond) at regular speed, would strongly affect my choice. The latter would be more boring, and also risky. I would forget more, and would likely make some different choices inadvertently. I also don't think I could keep the secret of time travel completely by myself for decades without needing to indulge it, which would put me in a completely different life path.
Now, what I personally think, contrary to most people when they discuss time travel, is that I don't think current "me" is inherently better than some other iteration which might have made different choices. Sure, the choices I made and experiences I, erm... experienced are the reason for who I am now, but I'm also fine with being a different person who developed differently. In a time travel situation, I would however not choose to make major changes which pertain to myself since I'm quite happy with my life now.
However, what I would change if I could are moments when I hurt others around me whom I care about, some of them deeply. Though I do care about my reputation, that's not the reason why as I wouldn't change every single mistake or want to seem flawless. I'm not a religious person, so I don't follow the concept of redemption, but some of my actions were truly inexcusable. The actions I have taken which I regret the most do not pertain to myself, as life carries on, but other people who I had no right to wound. I would absolutely take those decisions back in a heartbeat if I could, even if it would "change who I am".