Thinking you could only make a good decision when you felt 100% certain. You can't be that certain of anything or anyone. Or, pehaps I should say, I still don't feel that assured or certain. So, how that has impacted my life is that I didn't take up opportunities which I should of, or could have and subsequently not experienced perceived major or important turning points in my life. I wish I knew back then, there are no guarantees. Just weigh up the pros and cons. And if the pros outweigh the cons, jump!