Wriring Challaenge, June 3rd

You can also find native speakers who would write "June 3rd," but if I'm not mistaken, "June 3" is preferable.

It is not easy to know what other people think about us.

Adding "other" helps create contrast between "us" and "people."

There are people who pretend to be happy to see some of their friends, colleagues or even family members, but when those people are not around, they saytalk about how much they hate them and that how hard it is to smile at them and be nice.

"Talk about" sounds more natural to me here.

Well, as for me, I'm generally friendly, energetic, and easy -going.

So, the first impression I give them wouldn'might not be that good, maybe, but once they get to know me a little, they realize how wrong they were, and how nice and friendly I am!

Or "isn't." The original phrasing sounds awkward tense-wise to me, although I think some native speakers would be okay with it.

:D What I just wrote about myself is based on the feedbacks I've gotten from my classmates or roommates that dorm when I was a student or afterI had as a student, at my dorm, or after I finished my schooling.

"Feedback" only has one form.
The last part sounded awkward to me. I think this phrasing is better.