Lunette Cup?!???!

So I’m 18 years old, never had sex, took the putacupinit quiz and got the lunette cup, so I figured it might be worth the gamble and I bought it. I tried using it today, and it kinda hurt going in, and then it wouldn’t open... and I’m also terrified of it opening inside me! It already feels HUGE in there, and if it opens...? How is that supposed to work? Will I be able to feel it? I figured out that using the push-down fold works the best because it gets it in there, but then how is there supposed to be space for it to open up?? And I feel like there’s a lot of friction from the silicone material of the cup even though I got it wet first.

Help!!! I really want the cup to work but I don’t want to be in pain!!!!