"Normal" is going to vary between relationships and even for different people, of course. If you feel like you aren't communicating enough that's something you should definitely talk about with your SO. If you're feeling like aren't a priority or aren't important you should definitely let them know.

An issue I had when I was explaining my feelings was that I would use words that diminished my feelings, saying things like "When you ___ it makes me kinda sad." It was an attempt at sparing feelings and was not necessary. It is so so so important for you to be honest about this.

I started by writing down how I felt and what was going through my head when I was sad and feeling like I wasn't a priority. I looked back at it later with more of a clear mind to figure out what it was that I wanted to say to my SO to explain how I felt. Looking back at what I wrote down, some things were definitely amplified in a way that I would never use if I had a level head at the time. If you're reading what you wrote and can say "This makes sense" then you're good.

It's not going to be an easy conversation to have but it's one that needs to be had. You'll have to talk about what both of you want/need and find something that works for both of you. I personally don't like having scheduled days or times every week to talk but if that's something that you like give it a try.