Thinking about doing something, but never actually going ahead and pursuing it is actually more common than you think. I’ve met very very few people (none I can think of off the top of my head) who will take an idea, no matter how simple or grand, or what the potential is, and then implement it. Some start, but most will lose hype in the idea within days if not a few weeks.
When we feel hyped about an idea we have (a new project, a business plan, etc), we feel the idea is brilliant, perfect, etc, and we feel determined to begin working. This hype never lasts however, no matter how brilliant the idea is in an objective sense. We eventually sober down and will easily begin pushing the idea further back on our todo list, if not completely disregarding it as being unfeasible or stupid. Every idea is stupid unless it works.
Being a Doer instead of a Thinker requires an excruciating amount of discipline. 99.9% of people can’t do it. Stop thinking you have a mental illness or any sort of problem, disadvantage or misfortune. You don’t even have a lack of discipline, if you’re comparing yours to the average person. Sure, Amphetamine might help, but it doesn’t mean you have ADD. Depression and anxiety can hinder progress and stop you from doing pretty much anything, but it doesn’t mean not being depressed or anxious will necessarily mean you will begin knocking big projects off your list.
Understanding this may give you a more accurate picture of yourself and put you in a more positive mindset. You don’t want to be normal, you want to be exceptional. Suddenly, there’s nothing ‘wrong’ with you — instead, you have a drive to work beyond your limits and excel at what most people cannot – Doing things when you absolutely don’t feel like it. Skipping naps and other enjoyable things to get shit done.