You're young and you're from a smaller country. I don't know what it's like there, but it's probably not the easiest, even for those who have it easier than others. It's completely understandable while you want to do something so ambitious and productive so soon in life! And I think that you should absolutely stick with it and hold it dear to your heart. You're a big dreamer and I think that's just as important as being able to wrap your head around coding and art. You
want to learn, and I can definitely tell! It's good to have a hobby that could put you well off in life while you're still young and not expected to do so much yet.
You're very mature, but here in the United States there seems to be a focus on the safety of children and young teenagers online. A lot of websites are hosted/based out of the United States, and by law, they're not allowed to let anyone join if they're under the age of 13. (You may have come across this already?) Even when I was young, these laws were in place (and honestly, I lied about my age, too). I personally think it's very hard to judge someone's age online if they never say how old they are. And when someone says English isn't even their native language, it gets even harder to estimate someone's true age.
I bring this up because, for now, you're better off not stating your age online. I can't tell you not to join websites (and I doubt you'd listen, I wouldn't have, lol), just to stay safe. But I can recommend you not give away your age. That will both keep you safe and keep you from getting banned or kicked out of websites. DeviantART included. Not everyone is understanding or nice there, and the moment they know someone is underage, they will report them for their own safety.
Now that I've said that, I wanted to say that I've made several free to use bases that people can use for points commissions on DeviantART, and you're welcome to create things with them to sell for points. (Some are species that aren't my own, so they can't be used outside of that website, but the owner of the species allows people to make bases that can be sold.
Like these ones.)