Do you know what your body fat percentage is? If not then could you post a picture of yourself?
The reason I ask is because a lot of doctors work out your BMI and then say if your weight is OK or not. IMO this is the biggest heap of crap ever because it doesn't take into account body composition. Most of the guys on here will be 'overweight' according to a doctors graph, the most muscular will almost certainly be classed as Obese!
85kg for someone your height really doesn't seem that heavy at all, check your bf% and then see if your need to cut fat