This is really just a matter of maturity and discipline. The OP is unable to say "No" to themself. Having discipline is being able to power through the boring stuff because you know it's important. OP does not need ADD drugs, all they need to do is commit to finishing a task, and not to pick up anything new until the current task is completed, no matter how "fun" the other tasks seem.
I have a problem with your "OP does not need ADD drugs" comment. How do you know? ADHD is a real condition. You wouldn't tell someone with bipolar that they don't need anti-depression medication and instead just need to "stop being depressed". You clearly don't know how hard it is to push through daily even with medication. Please be more empathetic regarding mental conditions you personally don't experience.
There are better ways. Drugs only block the problem, but there are methods to overcome this dis-ease.
Believe me when I say I have been there. About 15 years depressed, always full of energy, but very difficult to concentrate it on any one thing. At some point self medicated for years with natural remedies, but ultimately only got addicted and had to let go of it completely, which vas very difficult and dont recommend to anyone.
Only thing truly that has helped me is meditation and yoga. Those two. They require no drugs, only discipline. Through this practice I am now able to focus, I am now able to relax, let go.
I believe ADHD is a condition which rises from the fact that our society and systems have become ever more complex, while our methods of working have not been adapted to this, and we are trying to cope with old methods of just "grunting it" through, when we need more of just letting go, relaxing, stopping and letting our systems be at ease.
Just to offer an alternative view on this condition, from someone who has suffered with this for the better part of my life and finally realized how to cope with it. It requires work, yes, but all good things in life do.
The medical companies know how easy it is just to sell some drugs and make a buck, and get people addicted.. so we are being bombed with false information also, which makes this very difficult, but I would recommend yoga & meditation & mindfulness to anybody who is suffering from this.