Your problem is not communication. It's self-confidence.
I don't think anyone of my team or the organisation that I work for likes me, and I am not sure what to do about it.
This is what screams at me that you lack confidence and self belief. It's almost certainly not true.
I've worked with people who nobody liked, but they are usually utterly obnoxious people with extreme arrogance and who are abusive to people and utterly self-serving. I'm not getting that impression from the rest of your post, not least because not being liked would not bother any of those type of people one iota. They would never ask the questions you ask.
So you're probably not disliked by most people. There will, of course, always be some people who dislike any of us, but that's normal - you can't please everyone.
What do you need ?
You need to speak to a professional counsellor. A psychologist.
It's not surprising if you have low self-confidence now because things are difficult for you in terms of achieving goals you want. You're probably at the age when practically everyone has a mid-age crisis.
Some other points that suggest your issue is self-confidence :
But I cannot communicate properly.
Very few people actually communicate well. I have a feeling you are startingg to look at your communications as a problem when in practical terms they're probably adequate. Practice is what you need, possibly guided by a professional, but if you start out believing you cannot, then you won't even believe it when you succeed.
I stutter when I talk... and cannot focus much (especially English is my second language and I work in the US).
Stuttering is a sign of lack of self-confidence, shyness. It's relatively easy to address this with the right counselling.
Lack of focus is addressed by going in with an solid outline of what you plan to say and sticking to it. Don't improvise, don't worry about what people think. If they want to ask questions, they will.
Follow the engineer's Golden Rule : Keep It Simple !!
I keep repeating the same point over and over.
This is what many politicians and business people do. It's not necessarily a problem.
I start seeing people complain... although they do not say it... but I see it in their gestures and faces.
You are reading things in their faces that probably have nothing to do with you or what you say. It's absolutely normal for people to be bored to tears in meetings and even more normal for them to think that everyone else is saying things they don't really care about.
Again, mis-reading people's expressions and fitting them into a narrative in your own mind where they don't like you is a sign of lack of self-confidence (and maybe some depression).
The reality : they're just as dinsinterested in everyone else who is not their boss or more senior to them. Some of them will only come alive when they want to be impressed by people who can advance their careers.
Add to this that I have rigid facial features and I think the way I talk makes people think I am abrupt... although I am very friendly and easygoing.
Again, there is a significant gap between what yoo believe people think about you when speaking in a meeting and what you think you come across in a human context. That's again (IMO) a sign of lack of self-confidence, particularly relating to speaking in meeting.
I have tried looking at YouTube videos of how to speak confidently and how to become a good communicator...
While there are some good communicators on YouTube remeber that they are all communicating in video. They can remove bad takes, they can edit, they can rewrite what they say, they use make up and audio filtering and a whole raft of other things to control the setting and finesse the result.
It's like any recorded performance - all those people will be quite different if you stop them in the street and chat.
It's an act. They are performing and they are by and large able to correct all the mistakes they made in editing.
You want to talk with a professional who can give you impartial feedback and techniques to help you.
An example : when I was younger I was speaking to a colleague in sales (I'm a technical person) and complimenting him on his presentation and slides. He asked me if I noticed the way he turned off the projector before changing every slide. I said yeas, but it made no difference to the presentation. He said he did it because his hands shaked so much when he was speaking that he didn't want it to show when he changed the slides.
I got the lesson : almost everyone is nervous speaking. Confidence comes after a long, long time. Very few people are truly comfortable at it. Most people don't believe I'm shy when I tell them, but it took me twnety years of effort to reach that point and it did require professional help.