I'm a sophomore undergrad who's constantly feeling anxious about the future because I don't know what to do in life and what I should focus on to bring success. I used to want being a scientist, and still do, but I know it doesn't pay well.

The past 3 months, I've been doing nothing except about this nearly every single hour, to the point that I can't focus on anything anymore. Grades &amp; extracurriculars all have suffered because of this, and I now have massive apathy towards these areas even though I know I should focus on them. 

Any thoughts?