I am good at communicating with people, even those who I have not seen. I am good at communicating with people, even those who I have not seen.

I am good at communicating with people, even I have not seenmet before. I am good at communicating with people, even I have not met before.

"Seen" makes it seem that you've never physically seen something before. (i.e. I've never seen your sister because she's always in her room.) Generally, "meet" sounds better in this context.

However I was not good at communicating, my communication skills used to be bad. However, my communication skills used to be bad.

"However" is a transitional word at the beginning of the sentence, so it needs a comma afterwards. The rest of the sentence I changed. You used "good at communicating" in the first sentence, and in the English language we try to avoid a lot of repetitiveness.

However I was notn't always good at communicating. However I wasn't always good at communicating.

For example, when I met my aunt after a long absenctime, she was surprised at my communicationg. For example, when I met my aunt after a long time, she was surprised at my communication.

In this scenario, we would rather say "after a long time" than a "long absence". You would say long absence here: After taking a long absence from my studies, I re-enrolled at university today.

For example, when I met my aunt after a long absenctime, she was surprised at my communicatingon skills. For example, when I met my aunt after a long time, she was surprised at my communication skills.

"A long absence" is grammatically correct but sounds a bit formal. "A long time" is more commonly used.

I was thought I did not like to talk to anyone. I thought I did not like to talk to anyone.

I wasShe thought I did not like to talk to anyone. She thought I did not like to talk to anyone.

AThe opportunity to change my mind ishat helped me was my entrance into a high school. The opportunity that helped me was my entrance into high school.

I changed this sentence to make it sound better. I think "helped me" is better than "change my mind", because you are talking about your communication skills improving, and anything that makes you improve obviously helps you. Here's an example of where you would use change my mind: You can't change my mind, I'm set on moving to Spain next year.

A opportunity tohat changed my mind iwas entrance into aering high school. A opportunity that changed my mind was entering high school.

I didn't know anyone at the school, so I had to talk to my classmates by myself. I didn't know anyone at the school, so I had to talk to my classmates.

"by myself" isn't necessary here

WhilThe more I did it, the better my communications skill was getting better.s got. The more I did it, the better my communication skills got.

Changed the sentence to sound smoother

WhilThe more I did it, the more my communications skill was gettings got better. The more I did it, the more my communication skills got better.

Now, I do not feel anything toxious when I talk to someone. Now, I do not feel anxious when I talk to someone.

if you "don't feel anything" when you talk to someone, that means you don't feel any emotion - happy, sad, scared, etc. Since you were talking about how your communication skills were bad but now they aren't, I put "anxious" instead.

Now, I do not feel anythingnervous when I have to talk to someone. Now, I do not feel nervous when I have to talk to someone.

"Feeling nothing" doesn't quite sound right in English;

Please correct this sentenceparagraph! Please correct this paragraph!

A sentence is just one line, a paragraph is a group of sentences :)

Please correct this sentenceparagraph! Please correct this paragraph!