When it comes to learning things, everyone is slightly different, so maybe a tutor site might work for you, or maybe not.
I'd say that when it comes to learning something creative, like drawing, animation, music or programming, it's beneficial to try and find the fastest path to being able to have a little fun and play around with the medium. If you can find yourself having fun and playing; you'll become more interested in learning more.
I'd usually recommend finding a basic tutorial on something, just to get you started, then trying to play around with what you've learnt. This will be your starting point. It sounds like you've already started playing around with drawing, so maybe you can skip to the next step.
After making a few things with your current level of knowledge, pick one thing that you want to improve. Since you're just starting, you might want to improve many things at once, but try to pick just one thing. With drawing; you might be able to pick up certain things by just looking at works that you like, or maybe you need to research the topic. Once you're confident enough to play around with the additional thing that you've learnt; you pick another thing to improve on and repeat.
I know this sounds terribly slow, but it will speed up over time. Try to keep it fun and experimental. I think that if you're using your own artwork in your games, you'll become even more motivated once you can see a finished game that's made up of your drawings, irrelevant of your current skill level. There's something special about seeing the pieces come together.
I had a similar issue when I was learning to compose music and the above is sort of the system I used to teach myself to compose. I'm still not great at it, but I now happily compose my own music for the games I make.
I hope this helps a bit. I'm sure that you'll figure it all out if you keep trying.