Is it normal to procrastinate something i enjoy??

I took a class on a subject I really enjoy and STILL procrastinated hardcore, so much so that I failed the class. What is wrong with me? I was genuinely excited about the final project but wouldn't sit down and actually work on it - I'd just keep thinking I could do it later, or (it was a writing class) that I'd start once I had more ideas. I kept doing other things (some productive, some not) when I KNEW this was important to me and knew I had to spend time on it. DUMB. Now I feel unbearable regret over this because I'm graduating in May and this was my one chance to take this course, and it's something I'm excited about as a possible career, even though I majored in something else.

I don't even want to think about changing my habits or moving on from this because I'm so angry about it. I guess being realistic I hope this helps me change but I think all I've done is blown a great opportunity that I won't get back. I think I put too much pressure on myself when it comes to creative works. I get really stressed out and feel dumb sometimes, like I'm doing it wrong. But then the stuff I actually push through and finish I think turns out pretty good, so it's like an illusion. I just can't stop thinking about how I should have sucked it up and done the work in this class, and how great it would have been, but I fucked it up.