What Could The Squishy Bag And Pain Near My Anus Be, And How Should It Be Treated?

Hi, I m quite embarrassed to speak about this but I feel i need to as i am worried. Also quick note i am 14 years of age just so that is known. 1 day about 3 weeks ago i was having a pain in my anus that i had never experienced before. I went in the shower and started to feel around and i felt this squishy bag on the sort of surface that i had never felt before and i was worried but i didn t know what to do so i just tried to push it back in which stopped the pain and i didn t feel it or any pain for about a week until i felt the pain again and i felt that squishy bag. I once again pushed it in but it has now appeared for the 4th time and I really don t know what to do anymore. DO you have any idea what this could be, if it is normal and how it can be treated? Thanks.