1.Wearing uniform is uncomfortable and stifles a person’s individuality .
2.I think waering the same clothes gives a sense of unity which is important in our school lives.

Plz correct my mistakes, thank you!!
cái này nghe có tự nhiên không?

"Wearing uniform" = unnatural
"Wearing a uniform" = natural
"Wearing uniforms" = natural
So: "Wearing a uniform/wearing uniforms is uncomfortable and stifles a person's individuality."

"I think wearing the same clothes gives a sense of unity, which is important in our school lives."
I put a comma before 'which is important in our school lives', because, although this clause adds detail to the rest of the sentence, the rest of the sentence doesn't need it to make sense. Commas are often used to set off descriptive clauses like 'which is important in our school lives'. These commas help split the information in the sentence into easy-to-read chunks, but they're not necessary - your sentence is correct with or without the comma.

(^^Forgive me if you knew all of that already. I just didn't want to change your sentence without explaining why.)