It's somewhat standard to get proofs in h.s. geometry (9th or 10th grade). However, 2 years ago I tutored a kid in this subject and his teacher never had them do proofs.

Why do we teach proofs?

Geometrical proofs offer students a clear introduction to logical arguments, which is central to all mathematics. They show the exact relationship between reason and equations. More so, since geometry deals with shapes and figures, it opens the student's brains to visualizing what must be proven.

Are proofs classes hard?

Proofs are hard because you are not used to this level of rigor. It gets easier with experience. If you haven't practiced serious problem solving much in your previous 10+ years of math class, then you're starting in on a brand new skill which has not that much in common with what you did before.