@Xdqwerty a free software option for drawing digitally is krita. (You'd preferably want a drawing tablet. You might be able to find an old drawing tablet for cheap.)
@Xdqwerty The best tip for drawing is to not stress over it. It's supposed to be fun. 99% of your work will be trash, but it doesn't matter if you had fun
@Xdqwerty Don't compare yourself to your younger brother. One of the reasons you could be bad is because you keep on erasing lines instead of trusting the process. Try drawing wiith a non erasable pen. It helped me quite a bit