Is it possible to get F grade in college even though I attended all classes?

Showing up is a duty. You signed. It's your duty to show up. It's expected.

The quality of your grades will be judged by how you perform the subjects, lessons and tests. If you pay attention, study well, cope with possible stresses and represent the questions/ tests and projects nicely, you'll get high score, if not you'll get low score and yes maybe a F.

I did it.  Not all that difficult

Hello
there! If you are a fool, it will be possible for you to get F grades in all
aspects of life, not just at school! Attending all classes doesn’t always mean
that one is studying, does it?! As a responsible individual you will have to be
serious with your homework, revision and so on. Passing or failing will both be
up to you. Good luck!

u should get a tutor to help bring ur grades up.