I’m not an artist but I guess this will help?
That is totally natural. Constructive criticism is good for improving your work but that does not mean you should be doing the happy-dance when you get one. It still hurts. You should listen and work harder but we’re all humans and we have feelings too
That’s understandable, again don’t stop your emotions it’s natural to feel bad
Even if your art work is trash It’s probably not just be happy with the fact that you actually did something and don’t intermediately go into criticizing yourself 