If you don't want to or can't return your new bike, then just keep riding it. It may not be a great bike but I'm sure it'll do for a while. Find a local group of bike riders who are open to beginners and ride with them for a bit, maybe they'll let you try some of their bikes. Talk to them about good local bike shops or even better, one of them might have a second bike in great shape they are willing to sell for cheap. The most important thing is to keep riding and having fun!!!