If its the math component that bothers you, I will help you with it, bro. I'm not great at math, and in fact think I probably didn't do very well on my first calc test, but I will more than happily lend you any assistance I can in terms of helping you grasp the material.
I grew to hate seeing people waste their opportunities once I realized how many of my own I've squandered. I'm seriously not trying to pick on you bro.
I tell friends of mine this in the exact same positions all the time. The ones that have listened feel much better for it and thank me later. The ones who don't continue to wallow in their misery, wondering why their life is in shambles.
Don't sit around wondering why your life is in shambles, bro. Start making it not a shambles. You're the only one who can do that. The only one. No one else can do that for you.
Look in the mirror, ask yourself "Is this really the way I want to live my life? When I'm dying of type 2 diabetes and heart failure from sitting around all day my whole life, will I look back at what I've done and be proud, or feel horrible regret?"
Its really that simple. Its your life, you can do with it what you want, but its clear you need some direction and I think going back to school will help you find that direction. Nothing in life is easy, but its definitely worth it.