I'm taller than Gwendoline Christine (<3) and I'm perfectly content with that. (6'4", WOOT.) That said, 5'6" isn't notably tall, not even runway height without heels. (I believe that's 5'8"-5'9" minimum? unless that's changed.) I can't tell you what to do, but I'd personally be saving my money for other things like YAY tattoos, FFS, breast enlargement if necessary, or you know, keeping money for a rainy day.