The biking is good! Every little bit helps. Keep going.
But if I were you I'd start recording every bite you eat at sparkpeople.com. It will be a revelation how much you eat. They also have a thing where you can take a picture of your food with your digital camera and upload it to the site, so you can be reminded again. I have a hard time remembering everything I ate at a later time, so taking pictures is a good idea.
Exercise makes you hungrier. If you focus on what you're eating, you should be able to match that hunger with healthy food instead of just more calories/carbs/guilty pleasures. I'd say DON'T focus on what you eat as far as cycling is concerned, despite how much attention is paid to it on this forum. Most of those people are doing 4-6 hour rides and it IS important for them. For you, and for me when I first started, just make sure you eat before you ride, have something to drink while you're riding, and then have something with good carbs and protein within an hour after you ride. There's plenty of time to focus later on how food affects performance.
Welcome to the forum! Good luck!
Karen