F##ed me over

I was assessed for an art project and was told I don't have technique, art is supposed to be about expressing yourself not doing it the way they think it should be done. I got a failing mark after working damn hard on it and driving all the way to Pretoria and back from Limpopo. A lot of people said that they liked my art but no one else's opinion counts but the assessor's she's not Leonardo da Vinci how can she say what is and isn't art? Now I'm not a good artist but I want to study art, how the hell. I think it's stupid and closed minded and not right towards me. I'm not happy, they need to get their sh#t together.