Start your own business. If you aren't afraid of work there is money to be made babysitting and doing odd jobs. Learn how to fix drippy faucets and to replace a garbage disposal and the plumbing under the sink and become the neighborhood handy person. Hand out fliers. Get your boyfriend to help. There are lots of other ideas too. Housekeeping, yardwork, etc. cash in hand.
I worked at a pizza place as a busboy (or girl whatever you want to call it lol) and I babysat. I got a good amount but most of the money came from babysitting. Because you're 16 you can get a job in a lot if places. You can work at McDonald's or any fast food place, or work at walmart or target or any store. Even a mall? Just apply for some!