I have an opinion that I would like share.
Please, by all means share your opinion.
My opinion is that I don't care about anyone's opinion
It's fine to have your own opinions, but you also need to understand and be aware that others have opinions of their own that are just as valid as yours.
I'm a man who doesn't need to hold my tongue.
I think it's great that you stand up for what you think and believe, just make sure you do it in a way that isn't harmful or rude to other people. These are things that can both exist simultaneously.