It depends on your goals and how much you trust the people you're communicating with (or the medium) to not turn your words against you.

"I should always speak in an uncensored fashion" is, honestly, one of the poison memes of the modern internet. It's never been wise in any human interaction, and moving to the Internet didn't change that fact. It did, for a brief time (until de-anonymization and search caught up with the technology available) let people obfuscate opinion origins behind a sea of anonymity and momentarily disrupt the words from the responsibility of having reputation tied to them. But when you go looking at the most anonymity-enabling communications channels on the Internet, you don't exactly find humanity at its best. Words divorced from reputation have yet to be proven as a net positive. Hell, even on Hacker News, our handles have karma points attached.

We social creatures developed concepts like "reputation" and tools like "memory" for a reason, and it wasn't a bad reason. Like any tools, they can be abused or over-applied, but no; saying exactly what you think all the time isn't virtuous (it is yet another tool, which can be abused or over-applied).

this sucks, Internet was supposed to be place where I can meet people and discuss different topics including some controversial ones,I am not talking about racism but more intellectual things like abortion, differences between male and female , gender topics. I may have an opinion on x and someone could make an argument and change my mind (in general most of us are ignorant and have a single point of view)

There are places on the internet where such things can be argued in a more intellectually supportive way. Just not all of the internet.

The internet is not just a place for meeting people and discussing opinions.

For many, many people, the internet is a socially supportive space, and an activity space, and those things don't work if challenging discussions are constantly taking place in them.

For what you've just asked for, specifically about making arguments that might change your mind, may I suggest you might enjoy: https://www.reddit.com/r/changemyview/ and https://changemyview.net/subreddit/ (I haven't used them myself, just read about them.)

I will check those reddits, though should people create a different account when going there?

I haven't used those reddits, and I don't have a reddit account anyway.

I think the fact it occurred to you to ask, suggests an answer. If you would feel safer testing the water with a different account, then I'd recommend you do that.

People have an annoying habit of attributing expressed thoughts to a person long after the person has openly changed their mind, as well as misunderstanding the intended meaning of a stated view anyway. Same if the person was just constructing an argument for the purpose of thinking things through (for example as in devil's advocate).

Personally, I would also recommend a "listen first" approach.