Menstrual Cups Question?

I have been doing a lot of research on these cups and finally decided to buy a Lunette 2. I'm 37, I don't have any children but I do have a super heavy flow. I am only 4'10" tall but I think that I have a high cervix. If I insert my middle finger I can just barely reach my cervix if I try really hard. I also think that I'm pretty narrow down there and I guess that I didn't realize this until today or at least I didn't realize how strong my pc muscles are.

I got my Lunette in the mail today and decided to give it a dry run so that I would be experienced with it enough when my cycle comes next week. I used a little lube and manged to get it inserted using the diamond fold. At first, it wouldn't open but after I moved it around a little it finally opened up. There was pain inside there and I was relaxed but it felt like I was having menstrual cramps and also like something was pushing up against my pubic bone. It was not at all comfortable.

When it came time to get it out, I could barely reach up high enough to grab it so I pushed down with my muscles and it made it come down but when I squeezed the cup itself, it didn't feel like it broke the seal, it felt like the seal got stronger. I tried to reach up and get my finger over the ridge but I couldn't. It took me a good 10 minutes of pain and frustration to finally get it out. I don't want to give up on these cups but this was really scary for me. I'm scared to buy another cup just to have to throw it away, it's a waste of money. What can I do? What am I doing wrong and why did it hurt so bad while I was wearing it?