I was trained as a Mechanical Engineer and now, run a few businesses.

One thing that really helped me figure out the answer to your question (which was my question too) was to take a step back from trying so hard to identify my passion or make a decision. Instead I focussed on doing a few things e.g. write a journal, read widely in any topic of interest to me, take long walks and relax. The mental break that I got from doing this relaxed me. And the practice of reading and journaling began to bring clarity to the direction I should take.

Hope this is helpful and feel free to ask more...