Time to visit the past!

At the moment you are 24 years old and and you just aren't happy with how life is turning out for you.
Perhaps a trip to the past would be nice, but you realize that any change you make to your past will effect the present. In other words, if you go back to then and do something you can never come back to now.... or at least the now you know.

But where to go???
You could travel back to when you were in high school.
Go back further... but that might not be best for your intentions.
Or you could go to another period in time. Location is not an issue either since you will get there eventually and can always travel to when you arrived!!!