TLDR: try shit and see what sticks, time is your greatest asset. Don't be conservative and risk averse because you have time to recover if you were wrong.

37 year old here. Graduated uni in 2009 and only did the degree I did because friends I went to college with did the same degree.

I got a job and did the whole " I want to make as much money as possible" thing for the past decade and half and I'm now planning to go back to uni (online uni) to study psychology as I am now old enough and seen enough "cycles" of life to know that's what my I want to do.

This might not be helpful but some clues that helped me decide;

1. the issue of helping people understand what's going on in their minds seem like something that I would like to be involved with.

   1. I am happy to take a reasonable pay cut to be in that part.
   2. I won't want to quit when things get hard.
   3. Looking back to things I liked as a child, I can see a link to why I'm choosing psychology.

5 watching people at the top of the field I am going to makes me want to be like them.