If you can find online blogging websites for your age group, you could try uploading your art there for a start. That's what I recommended to my kid sister when she was younger and wanted a dA account.
I can't help very much but at the moment I've found sites like: http://imbee.com/
I could try looking around more later. In the mean time, you could also perhaps post in the art forums? You could start a thread and post your art!
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