get my black belt in karate

i have started with Shotokan Karate when I lived in Germany. Before I left for Michigan I was awarded the green belt, but now I cannot find any Shotokan dojo in my surroundings. There is a club of some korean style karate at MSU. I tried it, but its quite different. I also feel frustrated since any white belt has much better (korean) technique than me. I can improve, but only at the expense of my shotokan experience. I am not sure, how long will I stay in Michigan, probbaly not longer than 2 more years, so I can make it maybe again “only” to green belt of this different style. realy stupid situation.