Why does my vagina have a tingling, tight sensation when just doing regular activities like sitting?

The most likely reason is a result of friction between or tightness from clothes and your vaginal area. The vagina and clitoris are very sensitive and this could be a reason you are having a tingly, tight sensation. It is not unusual to have sensation down there when you do activities because the vagina is also a part of your body and has lots of sensation (just like your fingers or your face). However, if this is a new issue that suddenly developed or if you find it getting worse, then you should consider speaking to a doctor if it bothers you so that they can do an exam and figure out why this may be happening.