Well, a first step is a first step
It's really cool you wanna apologize after realizing, but if you want to be forgiven, you may need to prove you're sorry for real, so please, next time, remember that everyone here's human and some stuff said can get to hurt us somehow, and think before commenting about their art how would the person be affected by it, alright?
You're young and you're still learning, so don't worry, I'm rooting for you and I know you'll do it sickly well!