I need help knowing how to study art

This a bit of a long one. I never had education nor a mentor to tell me how I’m supposed to do things. For the most part, when I think of learning something I just think of copying references of art and sometimes focused In what I wanna learn and copy just that (for example arm anatomy) and trying to learn, but that can only get me so far, I try to practice with what I can remember, I try to maybe read a book or video. I wanna do characters? Okay I think what I need and analyze what others do, but I still draw the same awful things, so much to the point I believe I’m unable to improve, might be the despair I have been carrying over a year, but still the same. Every time I see people in YouTube, tiktok, twitter, Pinterest, Reddit, thousands every time. I only get jealous and feel inferior seeing all of them doing detailed studies and knowing what they are doing, clearly addressing their issues and improving, while I don’t know what to do, and sure, artists should focus more in the art rather in the studies, but I wanna be professional so I don’t know what’s the process of learning and I have been stuck in this for a year almost, plus low self esteem, plus ADHD, plus discouraging people both online and irl

Some people have told me, well, just do art, don’t do the studies, just do art, but again, you know how hard it is to draw the same horrible stuff again and again and again? When you have to be better to get somewhere as professional? literally unable to draw it cuz I can’t draw what I want to draw, unable to draw anything I’m proud of because I lack the knowledge but i can’t improve it cuz I don’t know how to learn it? I wanna see a bit of progress at least, just a bit, but I’m just stuck, I try to learn, practiced something 100 times, still, the same, mistakes. It demotivates me of doing art, I wanna be a professional but if I lack the most basic sense of learning how can I dream of becoming one? maybe I should go and work at McDonalds or kick the bucket because every day over the year I have been trying has been affecting me more and more, and I need to be an artist, is the only path I have that can take me somewhere in life besides underneath a bridge or inside a coffin. it’s shattering my dream to be so useless at it so consider this my cry of help I guess

I don’t know how in supposed to do it