I thought about this during my road trip today. I think I'd tell myself. Know yourself, know your boundaries, know your values and do not budge. Do not let loose of one inch of your boundaries. If you say you will not live with something - do not live with that something. Protect them, for they surround your soul and your happiness.
If I could have done that I think I'd have made different decisions even if I didn't have it all figured out yet.