If you're for real, you're on a flat-line trajectory to nowhere. If you don't deal with this now you'll soon be 30 years old and living with your parents. You can learn to fly later -- right now you are too poor to fly and there are far more important ways you need to invest your time and money.
The cost of living will outpace the compensation for sign-spinning and other odd jobs. We do not live in a leisure society and you need to make yourself useful in order to find and keep meaningful employment. Maybe that means going back to school if you're able to afford it and disciplined enough to succeed, or maybe that means apprenticing as a plumber, electrician, appliance repair, etc. I'm guessing that $15k would seem like a fortune to you at this point but it won't carry you through the next 50 years of your life. You should find a friend who makes more than $12k/year to look up to. You seem to live in a very small pond and you need to get out of that environment to learn how to succeed.
I don't know you but you appear to have at least average intelligence and Internet access, so you are plenty capable of following the advice people are giving you. You can do some basic research on what jobs are listed around the country, what the average pay is, and find something that pays a living wage and intersects your interests and abilities. Work on that and save the flying for when you're out of the poor house.
I don't see any point in getting through the lessons now if it will be 6 years before you can afford fuel. You'll just need to go through it all again to refresh your skills. If you were a young kid then maybe it would be a noble preoccupation to mow lawns for lessons but you're a young man now and you're not pointed in the right direction.