Versatile! You can get one that's "normal" at beginning and have knots after some length. But you have mentioned you have rather shy cervix, so better keep that length down 🤔
A second option would be this. I don't know if it's a good option for a main dildo but I'll have to find out somehow.
https://cdn.azzamo.net/69a840f04e9dc5da740526d307fbfd4de8fb46ad5879f375fb1acaddf9961106.mp4
#nsfw
Discussion
If nobody's using the dildo on me, it's ok at any length. The dildo doesn't care if it doesn't go all in.