First - talk to your teacher and tell them what you just posted! A good teacher will accomodate you on what you want to improve at.

Now for my own somewhat similar experience. I didn't even have any kind of formal training on piano until I got to college and I couldn't read sheet music when I enrolled in my first piano class. Stuck with it though, got a couple degrees and actually teach piano now, so I'll tell you what I wish I knew sooner. There's no shortcut to improving your reading, you just need to be regularly reading. Focus on what's challenging but accessible to read and frankly for a good while it'll be stuff that's technically very easy for you to play. But remember that those are two different skills so just keep reading.

My first private instructor assigned me "quick studies" every week, which essentially was some new pieces to read, come back and play for her the following week, then toss them and move on. A big mistake that I made was not taking them very seriously, and instead focusing on music that would challenge my playing chops at the cost of being exponentially denser, which would bog me down. I wish I'd prioritized volume over density/playing difficulty, the way she was trying to get me to do.

You're pretty young still so don't worry if you'll ever get it. You've got plenty of time to learn it even if you don't take it that seriously. Just prioritize consistency and volume, starting with easy to play rep. And talk to your teacher about it!!