I don't believe there is one right answer to anything, and you'll probably never know 100% that you made the right decision in many cases. However, just because it wasn't an absolutely guaranteed right decision, doesn't mean it was a wrong decision. Most times, there are any number of good decisions you could make, with little to choose between them. You say you are questioning a previous decision, but if you had chosen differently you may still have been here asking the same question in the other direction. All you can do is make the best decision you can with the information you have at the time and with the feelings you have about the circumstances.
For example, I was unable to continue in my first career due to personal reasons. I was offered an option to go back to college to retrain, I just had to pick a subject. I narrowed it down at the time to IT or Librarian, I chose IT. Even 20 years later I wonder what would have happened if I'd chosen Librarian, whether I'd be happier, whether it would have been a better fit. But I'm OK with my career as it is, and I can't go back and see what would have happened, so why dwell on it. I'll never know 100% whether it was absolutely the best decision I could have made, but deciding on IT was an OK decision and has given me a lot of opportunity and a decent career.
In short, make what looks like the best decision you can at the time for you and your life goals.