I just wanted to cheer you on a bit!! I was almost your exact height and weight about two years ago...5'5" and 256lbs. I'm down nearly 90lbs now. Size 24 to a size 10/12. It's a constant battle but it is something that you CAN do and cycling is a great way to get started. Finding a great LBS is a good thing, but TE has been the best resource I've found. I'm not a big poster, but I'm a big reader and searcher. It's quite inspirational. Goooood luck with riding!!