I'd say don't quit, but learn to be careful about how you spend your money. Don't spend it on classes if you have to choose--class or fabric.
I know, that's probably mean of me to say, but you can ask your questions here or find instruction on the internet.
Just go slowly. Look around you for what you can cut up and use. As someone suggested on page 1, use Bonnie Hunter's site to guide you for scrappy quilts and then let people around you know you can use their 100% cotton shirts, skirts, dresses, etc. You could even go to the local thrift store and ask if there are ever any items they can't sell due to stains, etc. Check it out.
Mostly if you get the word out, you will probably get supplies, unless you just beg all the time. People don't care for beggars, but they do like to help people who are looking to do better and trying to make the best of a bad situation. (I'm not saying that you are begging, but that people don't like whiners or beggars--either one.)
There are plenty of people who don't sew anymore, who would like to get rid of their guilt--(stash), or partially finished projects. Let it be known around you that you are interested. You might be surprised what you end up with. Be a creative thinker.
Don't think that you have to completely finish one quilt before you start another top. You can always ask for battings, gift certificates for birthdays, Christmas, etc. Be specific as to what you need. Probably people will get what you ask for if you let them know very specifically. You can let the tops pile up while you wait on the perfect backing to come your way, or wait for a batting sale (or a birthday gift card). So glad you found this hobby. But really...clothes are so prevalent everywhere that if you learn to do scrappy, you will never run out of fabric!