Listen to Ixion , Kave and Beemer for they be wise. You indeed be small but that should not matter. Weight carried high will be issue for low speed handling, fast cornering(momentum can be a bitch(counter steering helps)) and for moving it around when its off (tip don't park facing down slope , unless you can get out by moving forwards). Seat height and width will also play a major part. The GN only weighs 140 kg(from memory) so most bikes will be heavier but you will get used to this. What bikes are on your short list(no pun intended)?
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