First time cup

Hi, I’m looking into buying a cup. I’m 17, 5’2 and an athlete. I’ve previously only used pads and tampons. Has anyone ever done lots of moving/running with a cup? I play volleyball and I’ve always been scared to try one and it be irritating or slip while I’m in the middle of a game. But besides that, is there a good cup for first time users? Or are there different sizes, because I’m relatively small. So many questions, sorry. Any help is appreciated 😁