the internet can be a really toxic place, so if youre very sensitive or still very young, it might not be the worst idea to take a step back from it for now, and just enjoy creating and practicing art without the intention and pressure to post it.
especially if how people react to your work on it, will make or break your will to create.
just have fun growing your art for now, watch some tutorials, allow yourself to make mistakes and make your art for yourself and for practice, and not with the intention of posting.
there is no hurry to start an art account or a webcomic. You have time for all that later when your skin is a bit thicker and you won't care about negative comments as much anymore