<p>Part of your problem is pulling all-nighters. Advanced classes - in pretty much every field of study but especially in STEM - require, as they say in Harry Potter, CONSTANT VIGILANCE. You can no longer wait until the night before to stuff all that data into your head. Go to your campus tutoring center and learn some study skills that will lead you to success.</p>
<p>This is important not only for your current major but because whatever major you want to switch into may not accept you if you let your grades slip too low.</p>
<p>Meanwhile, you need to have an honest talk with your parents. If you can show them that you’re truly doing your best but either cannot succeed in your current major or dislike it so much that you are willing to make alternate plans (including possibly financing the rest of your studies on your own if they won’t help), they may well come around.</p>