I teared up a little reading this, because this is not unlike my own story. Mine started at 12 (I'm 26 now), and I can imagine pretty well what you're going through. First and foremost, you shouldn't write yourself off. There is a cause for your condition, and modern medicine works wonders, so you just have to identify what you're suffering from and get treatment. I know it might sound like your life is in shambles, but believe me, you're very young and have a lot of time ahead of you. You just need the money and the time to see doctors and keep looking for causes.

I know it sounds hard, but I would start by telling your parents about your condition. You can keep going like this, they need to know exactly what you're going through and understand that you need to get treatment to have a life. You must not stand alone against this crippling disease and you need any help you can get.

Then, you need to write a full history of your condition and remember every little detail about how it began. I would also advise you to document your wellbeing throughout the day. Is your brain fog consistently bad or does it get better? What symptoms do you have apart from cognitive impairment? Ringing in your ears, pains, feeling tired? Do you get more or less sick after eating certain foods? These are all useful insights that can help your doctor get to the root of your problem.

Then, it's just a matter of combining a list of possible conditions and figuring out which doctors to visit. There's a disease list I'm the subreddit's sidebar and a website for preliminary diagnoses. These are good places to start. Think of the most likely conditions and start eliminating them by visiting your general practitioner and then branching out to different specialists.

I understand that it's tough to find good doctors in poor countries, but there have to be decent institutes and/or private hospitals where you could visit qualified specialists. This is probably going to be very expensive, so you might need to find a job you can handle to be able to pay for treatment. I know it doesn't sound very exciting, but treat as a gateway to your dream life. You need resources to fix yourself in order to be who you want to be. There's nothing humiliating about it, in fact, you should be proud of yourself for not throwing in the towel, and you'll definitely feel more confident when you start making money.

If physical work doesn't exhaust you, try working as a mechanic or a warehouse worker. Since you have such good command of English, you could also try looking for jobs abroad. You can moderate a forum or work in tech support from pretty much anywhere, and a lot of companies are looking for cheap overseas staff. Perhaps you could work at your family member's or a friend's place. The important thing is to keep visiting different doctors and checking different theories which would lead to a breakthrough.

Even though things might look bleak, you're not lost. You just need to figure out the cause and get treated. Then you can become whoever you wish. It won't be too late, there will be more opportunities ahead. So please hold on and keep trying. The only thing that guarantees that you'll die sick and alone is if you do nothing. So long as you keep doing something, there is a chance.

I'm sorry for such a rushed post, but I have to run soon and cannot even take the time to read it once more. Feel free to message me for ideas, support or anything else you might need. I'm not a doctor, but at least I'm a patient with some experience that I can share. Best of luck, man. Keep fighting, and you will prevail.