<human>: Hi Reddit parents and older siblings,

I'm hoping you can help me with a problem that I've been having for a very long time now that I'm sure you can relate to: my younger brother.

He's always been the temperamental one. He's smart as hell, but he never gives any effort. It worked in high school, and he went to a good college, but ever since then, things have been going downhill. He talked about changing his study habits and becoming a dentist. However, he's now a senior with a 2.6 GPA and the exact same work-ethic as before. Needless to say, dental school is out of the question now.

I've tried everything: talking to him calmly, yelling at him, begging him to work harder, but more often than not, it ends up in him threatening me to get out of his room or else he'll punch me in the face.

The thought of my younger brother, so full of potential, waste it all and underachieve until he's 30 and wishing he'd change his life sooner, kills me. I feel like I have a responsibility for his well-being, yet I can't do anything about it because he simply won't change.

How do I get through to him the fact that he can be so much more than the lazy, apathetic person that he is?

Condense the text into a few key points
<bot>: If you're a younger sibling, work hard for your older siblings/parents because you don't understand how vested they are in you.