I have had those feeling before, especially the first and last few weeks I joined this school. It is hard. But you get over it.
I never put up a front, if I am sad, my friends will know, if I am angry, my friends will know, if I want to be alone, my friends will know. I try not to take out my frustration on friends and should probably not show my frustration so much, but I can't help it.
Talk. Talking helps me think, let go and move on. Just confiding with someone or just talking to someone who will listen helps me get my act together.
I also try to keep my natural frustration and self pity to a minimum by sometimes scolding myself and showing myself how lucky I am.