BI was brought up in a family in whichwhere quarrels and tensions awere common, iI am kind of nervious and anxious when in crowed situations. I was brought up in a family where quarrels and tensions were common, I am kind of nervous and anxious when in crowed situations.

You could also say "when in big crowds" or "around lots of people"

I have not been not good at dealing with others since iI was a little kid. I have not been good at dealing with others since I was a little kid.

HenceSo, iI spend most time talking to myself instead of having fun with others. So, I spend most time talking to myself instead of having fun with others.

"Hence" isn't commonly used in writing now

After graduation from university, iI landed a job recommended by my classmate who once worked there as an intern asin exchange for my favore helping him on his graduation thesis. After graduation from university, I landed a job recommended by my classmate who once worked there as an intern in exchange for me helping him on his graduation thesis.

All iI need to do is to get onto the office at 10am and get off at 5pm with a two-day weekend, which is rare in this era where the alleged 996-working-style (9am-9pm,six days per week) prevails. All I need to do is to get to the office at 10am and get off at 5pm with a two-day weekend, which is rare in this era where the alleged 996-working-style (9am-9pm,six days per week) prevails.