Hi, Thanks for using HCM.
Only with examination or with investigations like USG or histirography we can tell whether you have septate uterus
or not. So you can get done USG abdomen and pelvis now(trans vaginal USG is better to visualize but avoided in virgins).
I think you might have confused vagina into uterus. Its difficult to put or remove any thing into/from uterus without doctor assistance. I think the tissue you referred must be in vagina. The tissue may be due to thickened vaginal secretion.
Hope I clarified your question. Feel free to ask me if you have any further queries.
Wish you good health. Take care.