What is best to use on period if you are tight or a Virginia?

(My questions are at the bottom) So basically I got my period shortly after my 11th birthday and since have used pads and since I go scuba diving occasionally on vacation I once tried using a tampon but it wouldn't work because it hurt too much like  quite early at the opening while putting it in so I didn't force it. I'm a virgin I still use pads but since I have a heavy flow I use really big ones and always worry that the outlines will show through my clothes. 
It is important to know that I went to the doctor who then put the tampon in for me because I thought maybe I did it wrong and that's why it hurt. Unfortunately she said it may hurt a little but it's not that bad but I thought it was a little to uncomfortable. I literally couldn't walk or sit I always felt it and I thought I needed to pee but literally my tampons presence was so strong I had to remove it after 10 mins cause I couldn't pee. I also found it hard to breathe... I tend to find it difficult to breath when I have a very heavy flow because I feel it flow so intensely... 
My question is: 
what is wrong with me? Is this normal and what other options are there for my period that won't be too uncomfortable ? (Ie. Cup or tampon?) 
P.s. Sorry for the long message! Thanks!

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