Hi, it is unnecessary size to breakdance. Finally it's on if you do its 2m10 may pose some problems may be small, but in any case, 1m64 you're not too big, you're even I would say. And even if later you grew up to 1 m 85 show 90, nothing prevents you from continuing to do. So now, you can start, and if you want it to be in a safe, golden rules:
1/Always warm up and stretch before practice. 2/Be flexible at all levels but especially at the hip (groin, lumbar, psoas).. 3/Having accustomed to muscling Sport and accustomed to the moves you want to achieve.
In your case, starts gradually, people tend to be pressed, but learns the basic movements, six steps, Three Steps, Two Steps for no ground and dome thomas, nineteen for aircraft movements (especially the dome here is the most basic). And of course the top rock lol.
Well, I hope it will guide you in your approach to break. Good luck and good dance !