In science, you can only ever have reasonable certainty for any empirical test. There eventually comes a point where scientists determine that the result is good enough, and move on to test other things. Everything science has ever discovered is built on what is most likely to be true, not what they know for certain to be true.

It’s similar when understanding things about yourself. Your doubts won’t fully go away, only be minimized as you learn more about what you like. There won’t be a magic sign that tells you what you really want; no definitive proof that pushes away all doubts. You’ll eventually need to settle for a likely truth, not an unquestionable truth.