I'm having a terrible burning sensation in my anus and around it. it's paining a lot when i am trying to poop. i am not even able to sit properly.

Anal pain: Many different problems may be causing the pain you are having: std, abcess, fissure, external hemrroid are only few of the possibilities. You need to see your doctor for evaluation and appropriate treatment.

See a doctor: There are a few different things that can cause this. You should definitely see a physician to discuss further and get it treated promptly.

More than Hemorrhoids is an anal fissure. Patients often experience difficulty starting the bm as if there is a blockage and then a tearing sensation during the bm, followed by severe throbbing pulsating sensation after the bm. See a colorectal surgeon to get a proper evaluation and find out what options for treatment are available to you.