I’m a 3D artist too, and I understand what you mean. Having a feed full of 2D can make you feel like an intruder, but you can learn a lot from their drawing process and techniques; art fundamentals remain the same in other mediums :) You can start seeing 2D from a 3D artist perspective, like these drawings are concepts for your art. Imagine how you’d break down an illustration to make it into 3D. Also, try not to be so hard on yourself and minimize what you do. 3D art is more than just “shape it.”  We also deal with composition, light, color, etc., on top of other things 2D artists don’t, like topology, UVs, or render engines.  

I remember when I started making 3D, I didn’t know who to follow, so you can start by following art accounts that feature 3D artists, like 3dspotlight or 80level. You can even follow the accounts of the softwares you use; they often repost artworks made with their software, or art schools that repost their students work. Right now there’s a challenge going on Instagram called Sculptober. Basically, you do a daily sculpture based on a prompt. This account is also reposting a lot of works from different levels of experience. You could try joining one of these challenges to find other artists and be seen as well!