<human>: Provide a brief overview of the text.

I'm a 16 y/o male and I've been smart but lazy my whole life, so far it's worked as I've done quite well. But I know that if I continue like this I won't get anywhere in life, especially now, as I want to go to oxford university. I've taken a ridiculously advanced math course for the next two years and I need to be able to put my head down and work harder than I've ever worked before. I have known I have a problem with lethargy/procrastination for a while, but it's come to a point where I know my future could be at risk.
<bot>: I keep telling myself I have to work and stop procrastinating but it never works, how can I change this?