Don't lose your confidence! Age doesn't matter, as long as you try your best to improve! Also, yes you should stay here! This is a great resource for learning basic anatomy and proportions. 30 seconds is a very short time frame, you shouldn't expect to be able to make anything beautiful that fast. Mine are often missing parts because I forget the Line of action and then get stressed about putting it in and making it look correct. I tried to put in pictures but the website kept asking for a URL and I couldn't figure out how to make that work so I gave up for now :/ Sorry...
Some other youtube artists with tutorials and art stuff that I like include Biana Bova, H.C. Brown, and Mark Crilley.
I hope this helps you, and I believe that you can become a great artist! がんばって！
