We humans tend to make decisions on a qualitative (emotional) level and/or on a quantitative (value/mathematical) level. Sometimes we make them on impulse and sometimes we give the important ones the analysis they deserve.
One major decision where I applied the training that I received in statistics and operations analysis was when my wife and I decided that I should retire from the Navy at 31 years instead of staying in, taking orders to Scotland or Spain and competing for another promotion which would have added about $900 a month to my Navy retirement check.
I had already made that decision at the qualitative level when I realized that I was uncomfortable with direction that our new "bean counting" Admiral intended to take our organization. I was used to "operational" Admirals.
My quantitative analysis was complex and mathematical. While an additional $900 a month stretched over the remainder of my life would be a lot of money , it was counter balanced by the fact that my probability of picking up that big promotion was only about 55% (estimated lifetime value .55 X $900 X 12 X 35 = $207,900) , and then my wife and I would be stuck overseas trying to do a job search. I would also have disrupted her career which was just taking off as an upper/middle level government employee. She would likely never fully recover from the dead certainty of that loss ( estimated at ($420,000).. By the time I finished cranking all the numbers, the mere act of staying in the Navy came to a highly probable loss of about $750,000. Which was an eyeopener to both of us and sealed the decision. I requested retirement from the Navy on the following Monday and never looked back. My wife also deserved to have the primary career at that point anyway. I was actually hired the very day that I retired from the Navy.
So making decisions is not always easy for us either. If you think that you have trouble making up your mind, you probably have good justification for feeling that way. Take your time on the important stuff.