I know how you feel. I'm a beginning hobby artist and I see all of this stuff on youtube and the stuff by the instructors. It intimidated and wonder how many years it going to take me to get to that level.

Maybe it would help you if you just copy the drawings of Stan's mannequins over and over again until you get the hang of it. Then it becomes fun again. Or.... let it go for now and practice drawing boxes; you can find lots of material on YouTube. (note to self ha-ha) When I'm stuck I do something completely different, like working on perspective. (Marshall Vandruff's '94 course is brilliant, have to go through that again too) Or look at vlogs of students in the arts, anything that gives inspiration. Then try again of course. Most of the time I feel inadequate, but it seems to be a part of studying the arts. We just have to accept it.

If you're burned out because you are frustrated at your progress, go back to the basics. Try gesture, bean, and robo-bean again. Then, get back to the mannequin.

Studying is hard work!! I try to make what I am studying relevant to my personal interests, it's hard to look forward to drawing yet another uncomfortably posed naked model. So, say I have to practice figure drawing, maybe it could be a pose from a reference of someone you are interested in like a celebrity or a family member, a superhero in a fight scene or original character or whatever. I like to draw with music on because I tend to find it can make my mark-making more interesting/fluid and can help influence a 'vibe' for the kind of image I'm creating, If you like the vibe it's much easier to get excited about completing it (and doing it in the first place). At the end of the day I'd say as long as you keep drawing, and enjoying what you are drawing, (whatever that is) you aren't getting worse. The learning process takes so sooooooooo long, if you find it boring, its simply not going to get done (let's face it) so it's just about trying to find ways that it appeals to you but you're still learning fundamentals. If it takes you a little longer to learn this way then so be it, the point is that it gets done and drawing does not equate to suffering, you allow yourself a bit of creative freedom and you can develop a personal style with ease, grow in confidence in something you actually enjoy and then when you really want to study the nitty-gritty you have the energy to do so. Well at least that's my process anyhow :) and I have ADHD so my attention span on anything starts at like minus 100 ;D

Truly, it seems that consistency is everything when it comes to practice. The only way to practice is to practice and unfortunately that is indeed the best advice I can give. There are many strategies and tips on how to build habits and those can be massively helpful but the denominator is always the willpower to overcome your other desires and sit down to draw. Meditation has helped me with this a good bit but everybody is different. I suggest starting back up with an easy goal such as put a pencil to paper everyday. You can then build from there but it is important to maintain a very good consistency especially in the beginning when your habit is fragile and in its formative stages. Hope this helps a little, best wishes!

If you're not feeling any pain when working out at the gym, then you're not making any progress. I struggled a lot with this too and to me there are two main reasons why. First was my lack of consistency. Some days I would draw and most days I would not because I didn't feel prepared. Drawing everyday keeps the skill more consistent. Second is to learn to enjoy the pain like working out. I still struggle with this but I've made a lot of progress by learning to move towards pain. I also really enjoyed this video on YouTube about motivational styles. It helped me explain the moments I was productive. It might help you too. https://www.youtube.com/watch?v=tRWX21lW_bU Furthermore, it is not the time spent that makes a master but the intensity of your focus.