How To Fix Writer's Doubt

When I was younger I wrote for hours every day, and I was very proud of every word. And whenever I didn't write, I didn't feel guilty about it, because I knew I was a good writer. I knew I was pretty brilliant, actually.

Now, as a full time film student trying to keep myself mentally healthy and have some sort of balance in my life, most of my writing I do for school.
And despite still writing for hours every day on different school projects, it doesn't ever feel like it's enough. I feel guilty...