Many people grow up with a social fear and don't know what to say when dealing with people, how can they change that?
Hello my friend! Seeing your question, I think you've taken an important step because coming to this platform to share confusion is in itself a safe way to socialize and allow you to feel more comfortable expressing yourself.

Social fear is actually a common mental disorder, and for those who have not experienced it, it may not seem like a big deal, but for everyone with social fear, the biggest fear is the fear of rejection or not knowing how to reject someone, so it often feels like being alone is the safest option.
Social fear can sometimes be a self-protection mechanism, because when we label ourselves as such, it's not necessarily because we're really afraid, but because we don't feel the need to force ourselves to run out of things to say, to avoid awkward chills, or to start shallow interactions.
If you do have a social phobia or social anxiety disorder, it is advisable to seek professional help to confirm the diagnosis first. Simply put, this type of condition often stems from a fear of communication, and it's a good idea to talk to a counselor to see if there are any experiences that are affecting your ability to socialize.
Darling, the world and I love you, I'm Hazan and I'm in and I hope that my response has inspired you in some way!