I think you need to give yourself the time to feel frustrated/ annoyed but then you need to put things in perspective.
It was just the proposal. It is only worth 10% and you passed. You then need to take all of that energy spent feeling annoyed and you need to use it to inspire you for the rest of the project.
Third year is a tough year, but to use a running analogy (because I find them really helpful). You've like two laps to go, the legs feel tired, you're getting cramp and part of you thinks 'Is it worth it?' but then you think about the distance you've come so far, and how much work you've put in and so you keep going. If anything, you think "I am going to push harder", because you want to finish and you want to finish well.
You're nearly there.
This is the time to dig deep.
All the best,
Oluwatosin – 3rd year student – University of Huddersfield