Trashed

1st year, 1st semester. Yesterday I did the first presentation of the thesis idea. The idea was a 10 min presentation and then 20 mins of discussion. My idea was pretty much trashed by the teacher arguing and even though he made questions, I wasn't allowed to speak to answer them. I did try, and he interrupted me again until the 20 mins were done and we had to move to the next person. I always liked academia, and suddenly I feel I'm completely out of place, and the feeling no one cares at all. I'm thinking on starting new. Use this year to reasess and develop the idea. But I don't even know where to start right now.