I have social anxiety and tend to avoid communicating . So many people misunderstand and dislike me . What do I do? I find it challenging to express myself.

Social Anxiety is difficult to deal with because it affects one of our main means of communication. It would be hard to convey that you are not good with being social because of your anxiety and the behaviour that you exhibit might be misunderstood by people and cause some to dislike you because they might for example think you're being proud or closed off. However, it would help to first talk to people you're comfortable talking to. Even better if you can discuss your social anxiety with them. As you speak to people you're comfortable with, it might help you get the hang of socialising.

This is a really good question. Something that has helped me when I need to communicate, is to laugh a little and just admit to the person "I get really anxious talking to people." When it is genuine, people are more forgiving/accommodating and this makes you more likeable. If you ever get stuck with what to say, people generally LOVE talking about themselves-ask them a question while you regulate your anxiety. *Side note on you feeling like people dislike you: I have never in my life met a person I did not like. Best of luck! Thank you!