It’s more interesting to read something where the author has taken a stace on something, and that stance is visible and upfront. For example, I much prefer “The difference between x and y is…” to “There is a difference between x and y”. Give it to me straight. In the latter example, the author may reveal the difference in the following sentence, but they also might not–the phrasing allows them to be ambiguous and not need to state any opinions.

If you’re writing from your own experience, be opinionated. Your experience is by nature subjective. There’s no need to be coy. If you find yourself using vagueness to impart an air of objectivity to your writing because “you don’t have an opinion”, then do the work required for having an opinion. Research both sides of a topic, if you see merits on either side, than that itself can be your opinion.

Mind you, opinions change. You will inevitably end up disagreeing with something you wrote. It’s not a reflection on your credibility as a writer. People change. Their thinking changes. I would find it more concerning if you were to agree with everything you’ve ever written. Don’t let the fear of future contradictions keep you from drawing your line in the sand right now.