(I am having a lot of trouble posting here...)
Aw, dearie, try not to stress about it too much.
I know it's one thing to say it and another to do it, but I know where you're coming from.
Growing up I never had a lot of support in anything I've done. Not from my parents, teachers or friends. And I have really low level of self-esteem to boot. I don't suffer from depression anymore but I still get into bouts crushing sadness sometimes.
I believe that when a person struggles with doing what they want, they're just not ready to get into it yet.
Look at me, I just turned 30 last month. And only now am I working at my comic in a way I think I can actually maintain. Finally. For almost two decades now I have been starting projects and dropping them, starting drawings and not finishing them. Getting excited about things, only to become melancholy about it and wonder what the point is.
Sorry, that was a lot about me. But the point I want to make is that there's no reason to stress about timelines, you know? As you get older you may start to realize that as well, there is no set time that you need to accomplish something by.
So maybe there are some things that you need to come to grips with first. Or just get used to having them in your life before you can move forward with what you want to do.
I know it sucks. It fucking sucks to not be able to draw when you really, really want to. But one thing that's helped me is to not push it. If you punish yourself when it comms to art it may not be that wonderful, freeing experience it should be.
If all you can do right now is sketch, then sketch. Sketching is wonderful practice and always will be no matter how old you are. Also, if you don't like how your colours look, try to find a different way to do it. I can't colour for on paper, so I had to resort to using computer programs. I still don't feel comfy with it, but what are ya gonna do? You can totally have a finished image without colouring it, too. Lucky for me. Wink.
I'm sorry that you're going through depression. Just try to remember that there is always a point to doing something, anything. But at the same time there's no need to feel guilty over something you're not doing. Because there's no rush, no time-limit. The most beautiful flowers bloom late, as they say.
Please feel free to contact me on Tapastic any time. Whether as a private message or not. I'd be happy to talk and also go over artsy stuff.