I am sorry to hear about the bullying

Best advice I can give you is, that IF someone happens to find your channel, then show them you take pride in your work

If someone ask you about it, tell them about it with passion - do NOT try to down-talk it, or find excuses for YouTubing
If you speak your channel down in any way, people will follow by talking it down, making things worse.
I try to keep friends/family and YouTube pretty divided, and do not post my videos on Facebook where all my friends can see them - However, if someone asks me what I am going to do in the weekend, and my plan is to make videos, then I honestly tell them that this is the plan

A lot of people do not understand why I want to spend my time making videos (and sometimes get next to no views), but when I take pride in my work, people tend to become more curious than mocking

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If they find out about your YouTube and decide to be jerks about it and make fun of your videos and you, try playing along and joke about your videos to. Of course, you know they're in the wrong, but you poking fun at yourself will just discourage them from trying, seeing as you don't care.
For example, if people at my school find out I make videos of a children's card game (I'm in Year 11, a Junior), I s̶e̶n̶d̶ ̶t̶h̶e̶m̶ ̶t̶o̶ ̶t̶h̶e̶ ̶S̶h̶a̶d̶o̶w̶ ̶R̶e̶a̶l̶m̶ would joke about it to, but still feel confident about myself.
And again here- there is a difference between talking negatively about what you do, and to be able to joke about it
If you can joke about it, but still stay confident, then this works just as well
