I feel like I'm starting the transition from stage 1 into stage 2. I just completed calculus 3 and introduction to discrete mathematics (which I realize is still VERY early into math education), but I'm starting to be able to read proofs and be able to utilize concepts without needing to be able to strictly have any concrete applications for those concepts.

It's very exciting, I feel like I'm finally able to play by the rules of math, and I'm looking forward to the places this newfound knowledge can take me.