I got my research proposal back today. 50 pages of comments. Red ink. Everywhere. My advisor wrote: "See comments" in like 40 places. I sat in my car and sobbed for 20 minutes. 

I don't even know where to start. Some comments are tiny—typos, commas. Some are huge—"this argument doesn't work" and "you're misunderstanding this theory."
I feel like a failure. Like I don't belong in grad school. Everyone else seems to get it. Why am I so bad at this?
For anyone who's been through this—how do you even begin? How do you not take it personally? Help.
I don't even know where to start. Some comments are tiny—typos, commas. Some are huge—"this argument doesn't work" and "you're misunderstanding this theory."
I feel like a failure. Like I don't belong in grad school. Everyone else seems to get it. Why am I so bad at this?
For anyone who's been through this—how do you even begin? How do you not take it personally? Help.