Hi eggg1994,
Thank you for your apology, it's accepted without reservation. That said, I'm going to offer a little more advice. I hope you can take this on board in the way it is intended.
To begin with, you are a beginner. You have very little experience, even in your own arts, let alone anything else. That is not a bad thing, in fact it can be great, because it means you have so much that is new and awaiting you, everything can be fresh, and exciting all the time. That helps your enthusiasm, which you certainly have in spades, but try to remember that it also means that there is a long way for you to go before you are able to realistically help people in the way you are hoping to here. And if you really want to help them, the best thing you can do is concentrate on learning, rather than trying to show what you think you know. Occasionally I'll see one of my students try to explain to another some aspect of our art... and, honestly, if they could see themselves looking back in a number of years time, they would be rather embarrassed.
My big advice for you is to stop before you hit "Post Quick Reply", and read the post back to yourself.... but imagine it's one of the young kids you help teach, telling you how things are. I'm sure you wouldn't let them explain things to you that way... but you would let them ask questions, right? You'd also let them tell you about their experiences. That could be a good way to post here for you, as Tez said.
As to the topic of being criticised, that will happen. Any time you put yourself out into public, you will be criticised. Sometimes it'll be good, other times it won't be. But the only way to avoid it is to not say anything in the first place, and I don't think that's the best option. It's better to know that that'll be the result, and to try to listen to what's being said to you, both the good and the bad, and see if you can improve yourself from it. I'll be completely honest here and say sometimes you won't be able to. And that won't be your fault, it'll be because the person who is being unfairly critical is being, well, unfairly critical. So you just move on.
In regard to bullies, the advice is similar. The best thing to do is to be a better person. And that means not "hating" or thinking of violent responces. By all means, physically, verbally, and mentally defend yourself, but don't seek it out, and don't look to engage when you can get away.