Today, most people want flashy, entertaining, and over-the-top people, activities, and anything to keep them occupied with short-term pleasure. Some people find this pleasure in drugs, alcohol, and amoral relationships of all kinds. They use these things and others in order to live a life of excitement; they couldn't have chosen a worse method because using those modes essentially means that without them, the individual is boring. If they need these things to be exciting, then, at their core, they are boring, but boring doesn't just pertain to lacking moral fiber. You can be boring for other reasons, too.
1. Perfectionist to the core.
Wanting to do your best is not perfectionism and neither is straining to maintain an A or even a 100. I find that perfectionists are obsessed with perfection in all aspects of their lives, to the point where they become rigid. To me, true perfectionists strain to be so perfect that they try to live their lives as though their bodies were computers and what they experience is a finely tuned algorithm, but life is a lot more than that. Extreme perfectionists seem to go at everything with that mindset--no room for error or surprises, but surprises and the unknown are what make life both terrifying and incredible, at the same time.
2. Being humorless.
Even if your sense of humor is fraught with puns, like mine, or knock-knock jokes, it's still important to have it because being stagnant is pretty boring, too. Humor shows at least some intelligence and the ability to relax. Ever meet those people that can't laugh? If you tell a joke, they tend to not understand it or point out a flaw like the Dwight Schrute meme. Humor is a fairly transcendent quality for humans to have. Computers don't have a sense of humor and are pretty boring of themselves. Every bit of entertainment on the internet was created by a human being. Computers only know algorithms, but humor is a quality that makes life less dreary and less boring. Rigidity is the problem here. Sometimes, you just have to be less resistant and go with the flow.
3. Being un-dedicated.
Life is fairly dry unless we're committed to something and have a drive. Maybe you want to be a brain surgeon, and others think that science is boring and you, by extension, are also boring, but if science is your passion, it's not boring. There is always going to be another person who is going to actually want a long conversation about the complex simplicity of atoms, other dimensions, time travel, and dark matter, etc. What is truly boring is living for nothing and having no drive whatsoever.
There are more ways to be boring, but it comes down to this: perfection, being humorless, and lacking ambition all fall into this category, but their opposites, flawed, humorous, and driven, fall under the category of being human, and humans are one of the least boring things in existence. Perfect is boring, but being human is not. So be a little crazy, nerdy, less than perfect, and funny, but most importantly, be human.