Why do I feel anxious around certain people?

Name: Ananya Roy.

DOB: 21 May 1994.

Time: 11:05 AM.

Place: Kolkata, India.

I am not usually introverted around people. But there are certain colleagues or friends of mine that I get this weird feeling from them. I have this feeling in my stomach and my energy feels really heavy.

So the other day I was going through Instagram, and they said it is something related to aura cleansing, so is it so and how to do this aura cleansing and protect my order to shield me from this people and also talk to them friendly.