Tampons. 😬

I have tried my moms tampons but they are so uncomfortable for me. My periods are always so heavy and I've had so many incidents when I bled through my pants while at school or anywhere in public. I feel so uncomfortable going anywhere while on my period because I'm so scared I will bleed through. What I want to know is what tampons would be good for my first time until I become more comfortable to them? Thanks.