I have had chronic anal fissure for more than a year now, i love lifting weights, specially squatting, it is my hobby , is that ok or i should stop?

Well,...: The increased pressure caused by the "Valsalva" maneuver when squatting can decrease the chances of your fissure ever properly healing. Since it has been over a year, it is best to see the GI/COLON Dr. and get it evaluated, wherein the treatment may involve Stopping the squats, at least for a short time, to allow the area to heal once treated. Best wishes.