Using mensuration cup for the first time

Okay, so I ordered sirona pee safe menstrual cup small size.

I inserted it straight first time that's why I felt a burning sensation so after watching a few videos I tried to insert again, it's not really hurting but I do feel it. So I am pretty uncomfortable while moving especially standing.

Please tell me how is it supposed to feel if inserted correctly? How does it actually feel after inserting for the first time? And if inserted incorrectly can they cause cramps and abdominal pain?

I am honestly really anxious... I have been thinking about switching to cups for a while but today when got my period I really didn't wanted to get rashes from pads and they restrict my movements alot that's actually the main reason why I switched and bought it in heat of frustration today 😭😭