I agree with the others, really, one is never too big to ride a bike. You always have the option of looking at used bikes, often they are not really all that used, people get things with intention to ride or they buy a bike to find they want a different one than the one they just bought. Craigslist may be an option. If you go check out a bike shop and they help you recognize the right bike and size, and if you can't afford their price, go to craigs list with the brand and model and do a search on Craigslist. You may find a real gem just waiting for you. Meanwhile keep riding while you look for that bike. Your height is not going to change, but your body will! That new bike will be a great motivator, while you look and once you get it. Take care.