I wish I had realized that I was still young. I had some early startup-ish projects in the late-nineties/early-2k's, they crashed and burned with the dotcom crash, and I felt like I had lost any chance at making something cool or any kind of impact. I even felt like, at the age of 28, I was too old for dating and had missed all my opportunities. Things picked up for me in every respect — professional and personal — a…
Married a paranoid schizophrenic with realising to late -- didn't know all family members (several relatives on the maternal and paternal side have it too) Know the family. Don't try to justify think you picked a healthy exemplar too early -- again: wait 2y+, know their past. Any clinical interventions: stay away.
Otherwise as soon as children are involved this will be years of horror. Trust me.