I also did proofs for the first time in Geometry. But the reason I think of proofs as more in Discrete, is that you usually get proofs immediately in Discrete v

I also did proofs for the first time in Geometry. But the reason I think of proofs as more in Discrete, is that you usually get proofs immediately in Discrete via number theory, graphs, or things like induction. But you usually don't really get proofs in analysis until you take, what real analysis or complex analysis? So you typically have trig, precalc, calc 1/2/3, differential equation and partial differential equations that is just calculations. That's my thinking anyways.