you'd be fine, the kid i usually ride with is about 130, no joke. he started on a kawi ninja 250 and upgraded to a suzuki gsxr 600 (same as mine) not too long after. he ripsss and handles it fine. To be honest, the MotoGP guys, the pro racers...they're all very lightweight and they right 800s and 1000s.
You wouldn't need weights or anything, my recommendation would be to take it into a shop and have the shocks adjusted to your body weight, that makes a big difference. any questions at all though, feel free to PM me, always happy to help ya out