I am feeling kinda low rn

So there was a girl in a yt video who was being very rude in the comment section she replied to my comment that she hopes that I can't achieve 100/100 in English literature and some negative and demotivating stuff. Since then (1 hour ago) I am not able to focus on studies and feel that my exams will not go well even tho I am very well prepared have solved the sample and competency and have done a full revision thoroughly

Please help me cope up