You are always free to change your mind and choose a different future, or a different past.
Get this in mind early: We never grow up.
You're going to die a horrible death, remember. It's all good training, and you'll enjoy it more if you keep the facts in mind. Take your dying with some seriousness, however. Laughing on the way to your execution is not generally understood by less advanced lifeforms, and they'll call you crazy.
We're all the sons of God, or children of the Is, or ideas of the Mind, or however else you want to say it.