100kg is decent but bear in mind you will never lift to your full potential as a newb. You are just not primed for it due to a variety of factors.
So build up and get comfortable with good, safe form. Then when you're confident, go for it and see what you can manage. Any relatively fit guy can deadlift well beyond their bodyweight, maybe even close to double, but the fact they are a newb is a limiting factor. Just challenge yourself every week, forget what others are lifting and you'll be surprised at the progress you make.