misunderstanding people

It was the first day of the high school, when I saw a girl sitting on her chair with an arrogant glance. I thought I can’t stand this kind of people, and I was pretty sure about that my judgement about that girl was true. But interestingly, when I accidently had a conversation with her, I saw that she was nice, kind and surely not arrogant! Believe it or not, after a while, we became best friends! This event gave me and idea about the truthfulness of first impression. First impression can sometimes mislead us, because the people we are judgeing can be in a bad mood.
Sometimes we can have hard times, so we can’t be ourselves. Even if I am cheerful generally, I can seem unhappy because of the things I’ve been getting through. So I can expect from people to understand this, but they may treat me as I was the one whom they first saw. First impressions may wrong us, but can we avoid to make judgements?
There can be some situations in which I can’t change my ideas which I had when I first saw the person. This proves us the importance of first impression. I think everybody makes some judgements, and these are hard to change. I mean, this is not particular for me. I know that my all friends do that. So, when we first met someone it is quite important to give a good first impression, to be remembered as a good person.
To sum up, first impressions can mislead us, and they aren’t to be trusted. But anyway try to seem as yourself when you first meet someone.