There is no going back to the past, jacking with the timestream, stopping John Wilkes Booth, keeping Pa Kent from having a heart attack, or avoiding the Butterfly effect.
There's just dealing with what did happen, and doing something about it and your life from right now onward.
So if you're reading this now, sitting in the dark in you're underwear in your lame-ass wannabe version of the Batcave, put on your Big Boy pants, nut up, do what you already know needs to be done, and get past all the bull***t self-talk you've used to justify your flaccid inactivity.
Nothing you do defines your value, or adds or detracts one iota from who you are at the core.
How you react to what's done to you says volumes about your character, and who you really, really are.