The Honda CRF230F has a seat height of 34", as does the Yamaha TT-R230. They are both pretty heavy, about 240 pounds.
A Honda CRF150 or Yamaha TT-R125L is a tad lower, 32" seat height. My daughter is 5'2" and she fits a TT-R125L just about right, or perhaps she is a tad too tall for it. If you are 4" taller I would expect you to sit rather awkwardly on a 32" seat. Note that the "L" in the TT-R125L stands for Large wheel. There is a TT-R125 that is even shorter that I am sure you are too big for.
Another question that you should consider carefully is if you want electric start or only the kick starter. The TTR models are available in either a kick only or kick/electric start. The Electric start adds 12 pounds to the bike due to the battery you have to carry around. Electric start is nice when you start getting tired and just don't have the energy to kick the bike back to life.
I suggest that you head down to a bike dealer and sit on a couple of different models. I recommend that you be able to put both feet flat on the ground Ideally you will be in contact with the seat with both feet on the ground. On a street bike you can get away with being on tip-toe as you typically have flat ground beneath you. On a dirt bike you will often stop on uneven ground and there may be a dip where you need to put your feet down.
I recommend getting some experience on something like a CRF230F. After a year or so you might want to trade up to something a little more aggressive, such as a CRF250X. You will definitely be on your tip-toes on that bike, however.
Rod