I don't take art lessons. I don't even have a deviantart account... and I know a lot of artists who are better than me. But drawing is like an escape for me, I forget my problems whenever I draw. It's like I could just pour everything that I'm feeling on my drawing. Like what musicians feel whenever they play their instruments.
I don't think anyone who wants to draw should stop just because of other people's opinions. For me, your opinion on your own drawing is the only thing that matters.
There's no such thing as bad/wrong drawing. Just remember that you don't draw to please people. You draw 'cause you want to. Well, that's my opinion.
If you think your drawing is good, then it's good.