Thank you Kaplods, your input has helped me a lot. When I went grocery shopping this afternoon I looked at what my local walmart had. This one is the one I think I want:
http://www.walmart.com/ip/Schwinn-Cl...-Bike/15711184
It seems to be a pretty sturdy bike. I took into consideration all the things you listed. The reasons for me picking this particular bike is the seat is big, practically everything on it is metal, it has only 7 speeds. I think just having 7 speeds will be good for me because I'm not good at figuring out the gears.