Random... and a little weird. Tampons wont stay in

I just want to see if I am alone with this and I am a weirdo.

But I noticed that the bigger the tampon the less likely it will stay in! And it's super frustrating! I have a very heavy period and need the super tampons because they at least last me around an hour. But those damn things wont stay in!!! If I sit down it's like my vagina pushes it out! I go to stand up and it's very uncomfortable because I can feel the tampon is not fully inserted.

I would joke and say that it's like a hot dog in a hallway but I dont have this problem with smaller tampons. And I havent had sex in years so I wouldn't think my vagina isn't super huge lol

Is this common?