Troubleshooting: hard to pee, sore after usage

I've been using a menstrual cup for the last 6 years and started to wonder if I'm using it correctly.

When I have the cup inside it's hard to pee. I pee less and always feel like I'm not fully empty. It's also harder to make a bowel movement.

After menstruation, when I no longer use the cup, my vagina is sore and it burns to pee for 3-4 days.