Is it wrong to be sad and upset over a grade you get in college? I mean, if you get a lower grade than you expected. Is it wrong to cry over it? Is it bad to lose motivation because of it?

And how can I help myself to be motivated again and work harder for a better grade?

I already work hard enough. Do I just need to learn to deal with critizism which is the comments that teacher writes to me for why I got a certain grade?

Does anyone else feel that a lower grade and comments that come with it do not make me want to work harder for a better grade?