I'm 42 kgs and my height is 158 cm,do you think I'm way too skinny?
I'm 163cm and 44.5 kilos. If I look at some bmi charts, I shouldn't exist! It depends on how you feel and what you look like. If you eat right, or at least okay, and weigh that, that's probably what's good for your body. Don't be too worried about charts and the like! They don't work for everyone, and I've found especially not for petite people.
You're skinny, but if you have a good lifestyle it's not a problem:)