New University students in Sweden are often told that they probably will fail a course in their first year. (I'm not sure if it's true for most students, but it is very common.) The idea is not to discourage them, but to make them realize that there is no shame in such a 'failure'. It can be hard to get into a new field, adjust to a new setting and a new way of learning/studying. But as long you keep at it, you'll most likely be fine.
Personally I got good grades my first year (philosophy and math) back in 2006/2007. Then I got depressed due to the stuff I was studying (political science) and burnt out from overworking myself for 13 straight years of school. So I dropped out (effectively getting a big F for an entire semester). I spent a few months just lying at home, feeling completely useless. But eventually I got bored and started do some programming for fun as well as some deep thinking about values and priories. It didn't take long to realize that programming was my true academic passion, that small "failures" were insignificant and that animal rights was the most important issue of our time. So I promptly applied to a Computer Science program, became vegan and joined a local animal rights organization.
Once back at university it was (almost) pure fun and I've been at it since then. But I've systematically been dropping out of courses when I've been too busy to do them (not doing the exam -> getting an F). But I'm still doing completely fine as I make sure to actually learn the stuff and complete the course later. My new set of priorities allow me to be more relaxed about it, so I can mix studies, work as a programmer and animal rights stuff. I feel much more harmonic now, compared when every single course felt like a life-or-death battle. Now I just fail stuff if I feel like it and take the course later. An F is a minor bump in the road, no worries!edit
: If you are having problems with anything that relates to angles/radians/trigonometry/sine/cosine/etc. I want to introduce you to one of my new best friends: Tau
. Here is a 5 minute video introduction to Tau
and the great The Tau Manifesto