OP, you made a thread about this very recently. You wrote that you're drawn to medicine because you want to be seen as an intelligent person with a prestigious career. The advice you were given in that thread still holds, even if it's not what you wanted to hear. If you have nothing stronger than other people's opinions and perceptions to motivate you, there will be no pros at all to doing medicine. I think you need to consider that the reason why you're so upset and dissatisfied with your life may not be because you haven't met some arbitrary self-imposed social standard, it's because you care far too much about arbitrary standards and this preoccupation is draining the enjoyment out of everything.
You've also mentioned that you don't yet have GCSEs or A-levels and you're currently teaching yourself GCSE maths and English. To be in a position to apply for medicine you'll need GCSEs and three A-levels at a certain grade, plus an adequate score on the UCAT. This is likely to take several years. I don't want to sound harsh, but this means any question of whether to do medicine or not is moot.
I think the best thing you could do is focus on enjoying your GCSEs. Both my siblings left school without qualifications, but fifteen years later my sister enrolled in night classes to study maths, English language/literature, and double science. She wanted to get some GCSEs, but she had no idea what she would do after that. To her surprise, she found she really liked biology and Shakespeare, something she would never have predicted! The best way to find what you will be happiest doing is to find the things that chime with your interests. It doesn't make any sense to try and plan a career change without knowing those. I'd also do what my sister did and look into the adult education programmes at your local FE colleges. Quite a lot of people leave school without the qualifications they would like and go back as adults, and being part of a community like that is a much smoother and more satisfying way to learn than trying to teach yourself from scratch.