There's nothing wrong with being opinionated! Even strongly. But you need to have a strong sense of humility to go along with it.

Know that any one of your strong opinions could be wrong. Know that equally smart people could disagree with you. Know that the world doesn't care very much whether you're right or wrong.

If you're asking this question because you're finding you have conflict with people over your strong opinions, the problem isn't that your opinions are strong. It's that you're letting them control you.