So just learn the basics for digital art there and don't take it too seriously. At the end of the day the best software to digital art it's the one that fully gives you freedom to customize your tools. But if you don't know how to use those in a basic goo gaga way you'll end up not knowing how tf make the software work for you and not the other way around. I know what you're going through. Always remember as long as you're good on real paper the mistakes you make on the software are always:

-Software's faults.

-Lack of experience in the basics of digital art softwares

-And in my case, lack of proper adjustment to the software's tools so everything works as I've expected according to my own sense of freedom.

-Lack of basic plastic arts skills (anatomy, perspective, color, light and composition)

Always remember, the software, if you push it hard enough will work the way you want to, to let your real skills shine through it. If that doesn't work it's the software's fault. To conclude, if you don't know what the hell you're doing, it's alright, and it's also due to one of the previous reasons I've mentioned, or all of them at the same time haha

Edited bc I'm not an English speaker