I was struggling with a body image because I was told I was fat by surroundeding people like a male teacher and my mother.

I would prefer a rephrasing to:
I was told I was fat by the people surrounding me like a male teacher and my mother.

Today I was told that you wereI was not fat just a few minutes ago by my male classmates.

If this is a quotation, you can keep the pronoun as you as follows:
Today I was told that: "you were not fat" just a few minutes ago by my male classmates.

I was like honestly I was extremely happy and I just gotdeveloped a sense of security.

Your use of like here is gramatically incorrect, but it is sometimes used this way. It's not a very educated way to speak. Think of characters like those in the movie Mean Girls if you are after an example of who would speak like this.

ThenNow, I want to talk about my education.

I was from a high school whose students were above average in my country and often go to average to high ranking universityies.

However, I’m now confident to say I’ve been to a vocational school, I really enjoyed it and I’m proud of myself.

the verb enjoy needs a subject

The reason is that I met very nice people in thisat school and gotdeveloped a new perspective.

I was like a silly person who looks down on students who isare in low levels of high school or university, so on.

Students is plural and thus you use are instead of is

I’m totally different now thanks to my experience, and I may be able to have a nice day every single day from now.

Thanks for my experience, and I may be able to have a nice day every single day from now.

This is not a complete sentence, so I have combined it with the previous one.