Just keep cracking and figure out where you went wrong with this lab report. I felt the same way when I started college. It's a whole new world. You can't just work hard and expect an A - you need to be smart and ask the right questions. I think perseverance is the most important here. The students who come in super prepared do very well at first, but it's the ones who can really persevere and learn from mistakes that really do well in the long run.
You should figure out where you went wrong, rather than blaming the system. One C- won't hurt you too much in the long run, but giving up this early or calling foul on something like this might. See if you can talk to your lab TA or lab instructor for advice on where to improve next time. Whatever you do, don't tell anyone (professors, TAs, fellow classmates, etc) that you think you deserved a higher grade. It will make you come off as being an entitled freshman pre-med. Hours spent does not equal deserved grade.
Keep going! I remember this frustration. After I found a tutor and utilized all the services my school had to offer, things became much more manageable, even as classes became harder. You can do it!