Sometimes I feel like going back in time and changing some things. If life would have a debugger would know when I am doing a mistake.

How would you know the correct if you never did the mistake?

Also, no mistakes. It's all about what you wanted, what you needed and what you get. Maybe you didn't get what you wanted but if you have what you need, it's a fresh start right there.
Think it like this. A bug of yours may be a feature of another.

I have no regrets. But if time travel was possible I definitely would mess up just about anything. "We need to test that probability. No, I don't care if the world would burn!"

@lostinmyworld Yeah but sometimes you realize that what you actually wanted then was the biggest mistake of your life and now you are stuck with a mundane life because of the fact that you chose something in past that you believed to be true.

Yeah but that's the deal. At the moment you did what you thought was right. How can that be wrong?

You must insert time to your calculations.

If(actionsmeetxpectationsanddesiresatthattime)
Instead of
If(actionsmeetxpectationsanddesiresNOW)