Interning is the dregs of the fashion biz and you work very hard doing stupid things. So there is always a lot to bear.
It's about making connections and impressing the "right" people (and you never know who that might be) more than anything. You never know who might be in a position to offer you a job or refer you to someone else ... so you have to guard your good reputation.
It's not really about being "hard" enough for fashion ... it's about being able to cope with any stressfull assignment ... because fashion, in any capacity, is stressful. People, who are going to employ you in the future, need to know that you can complete the job and that you won't crumble in the middle of a tough assignment.
I think it's OK to comiserate in a place like tFS ... and a good place to blow off steam. Be careful, though and don't sound too negative (you aren't, you actually sound positive but tired). Especially, if that is your real name ... employers search by name and email, before hiring.
Also ... I would not complain at work, even to fellow interns who are your friends. A "friend" who is also an intern or a lower level employee might have a hidden agenda and your "complaints" might get back to the bosses or someone else who would have referred you to a possible employer. Watch your back ... anything you say can get repeated.
The biz is very small and people all know each other ... and they talk. So any negative talk can come back and haunt you.