Hi Ciaosara!
So, there's this thing that happens with pole dance, as with a lot of other fitness and similar things...
The need to "keep up," or to be just like everyone else. It's a form of self-judgement that will just ruin your happiness.
I started pole dancing 9-ish years ago. I wasn't really consistent, but all of my friends and everyone around me started inverting WAY before I was close to it. They kept doing it, and I kept... not doing it.
Even now, I started really trying to be consistent. I started taking classes, lifting weights, lots and lots of things! I'm much stronger than I used to be...
But I still can't invert well, or often, or on both sides. I struggle with it a lot.
So, in order to get to your invert, you're going to have to get uncomfortable. You'll have to take the classes and keep plugging away at it, even as the people in the classes change and move on, over and over, and you're still there. You're going to have to get uncomfortable with your challenges, with your body, and with your own self-judgement.
However, it does NOT mean you can't pole dance! There are SO MANY other things you can learn. You could stay grounded, and learn the millions of beautiful, sexy, fun moves that are based on the ground or the floor. You could climb the pole and remain mostly upright, because there are lots of moves to be had in that position, too!
Good examples: I'm working on my exotic dance right now, as well as getting back to my Cross Knee Release, with hope to get to the Cross Ankle release (they're also called laybacks). I could work on my Teddy hold, my Figurehead (or Hood Ornament, depending on where you're from), my Apprentice. I could also do so many spins!
And, all of these things create strength, grace, and skill that will bring me closer to the invert, too.
So, please try not to feel discouraged. I know it's frustrating, I know it's hard to have so many people move on from where you are, and to not move on with them. But, you're still valid as a pole dancer, even if you never, ever do a basic invert. You're still amazing.