Please help me,I'm 13 years old,14 in December, I started my period a while back and I'm on holiday and I came on, I used tampons so I was able to swim still and I think i was putting them in wrong and   I tried to put another in, but something was blocking it so I put my finger in to see and around the whole there is something like a lump or some sort of swelling but no pain at all apart from when I tried to put the tampon up last. I've came off now and started realising brown discharge for a few days,what is this and what shall I do? I'm really worried,someone please help