Butt plug keeps falling out (first time)

I got a 9cm/3.5″ ball butt plug about a month ago and just got the courage to try it today and to be honest it felt great in there so I had the idea to get my errands out while I was in there, it felt great at first and I even felt more confident but I felt it kept trying to come out which was quite off putting as I had to keep pulling at my panties trying to get it in and flexing my pelvic floor muscles. It’s only 2.8cm in diameter and I already have experience with dildos, is my anus normally this big? Do I just need a bigger diameter dildo or have I stretched myself out with the dildo (it’s also fairly new)

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