I remember seeing this quote somewhere. It was anonymous.
It is so powerful though. When wondering what to do, just keep moving forward. You really cannot go backwards.
This does not mean you cannot go back to an old job, old town, old lover, old ideas. It means venture forth and continue to make choices intentionally and do not dwell on the past like you can undo it.
You cannot shape the past. You cannot shape the future. You can shape the present.
The only way out is forward.