Hey Sha, thanks for the kind words :)
There's no easy way around that. I don't think you have a problem with boredom, it's more of a self-management capacity that everyone struggles with. To me it's easily one of the most important skills there are, but it's also something that no one has complete mastery over and is elusive for any human being at any time of life. I struggle with this daily, as does everyone else.
You can call it discipline, but it's not just that. It's knowing your motivations, knowing yourself, reminding yourself daily why you're doing what you're doing, remaining focused and then being disciplined to get the work done that needs doing.
Mark Twain said that we're not smart enough to remember all we know at any one time. That's absolutely true. If it wasn't, then you'd never have trouble with boredom, you'd always remember why you're doing what you're doing. Whether to change your own life, to help your family financially after a few years, to express something that you feel like no one else is addressing, or just to pursue an interest that you feel will make you happy - you've known the reason why you've started, it was crystal clear at some point. But daily stresses and mundaneness put a film of dust over everything, until you can't quite remember why it's important to do what you set out to do.
Number 1 and king of all reasons to do anything is always just the simplest - "why". Why are you doing what you're doing? What are you hoping to achieve? Why is this something that you're pursuing. If you can answer that, you can overcome any feeling of boredom. Why is the reason to get up in the morning, why is the reason to sit down to draw.
Number 2 would be to develop a schedule. We are hugely driven by habits. It would be virtually impossible for us to accomplish anything if we didn't have a huge repertoire of automated behaviours. Probably around 95% of the things you do in a day are automatic, your thoughts are not necessary, you don't need to focus you just feel compelled to do something and you're doing it without thinking about it or while thinking about something completely different. When you brush your teeth you never think about what you're doing, you're not calculating rotating motions to guide your brush through, you might not even notice you're brushing your teeth. Habits are what drive you to compulsions. When you sit down to draw and get bored, chances are there's something else in your mind that you're driven to do that becomes intensely frustrating after some time. I check emails and websites 500 times an hour if I don't unplug myself. It's not good enough to just try to control it by sheer force of will, you need to figure out a way to physically prevent yourself from doing what you normally do. Otherwise it's a battle of attrition, you will run out of willpower.
The converse side of this is to develop good habits. Begin repeating things that you'd like your brain to repeat for you. Have a routine of daily practice. Figure out what you'd like to improve, have a plan of things you'd like to study, then at a certain point each day sit down and start working on those things. I always find it very easy to get my work done on a work day, I know I have limited time and I have a set routine each morning - wake up, cook, draw, go to work. On a day when I'm not working I always screw up because I have too much time and options and I inevitably get drawn in to doing other things. Develop a realistic schedule. Have something like 10 figure drawings, 5 color studies, concrete things you can do. Not "work for 6 hours now" If you don't know what you're doing you'll get lost, then you'll get frustrated and bored.
I think I'll stop myself now before you have to scroll down the page to look through this whole thing. Basically - why are you doing what you're doing, separate yourself from compulsive behaviours that distract you from your work, develop a routine, practice at a consistent time and have concrete work you know needs to get done. Might be hard for a few days, but we automate behaviours very, very quickly. Before you know it you won't be thinking about what you're doing, you'll just be doing it.
Some more stuff I'd written on the topic before - http://www.inpursuitofart.com/blog/4-ti ... ay-course/
Good luck :)