I need help

So I recently bought a dildo, and for some reason it kinda hurts. It’s the same size as my ex and my ex and I used to have sex A LOT so I know the size is not the problem. And when I take it out the dildo itself is still dry. Idk if I’m not wet enough (even tho I feel myself and it’s wet) or what but; any tips on being able to use it better? because it doesn’t feel the same way as it feels to have sex. I know it’s not gonna feel the same but isn’t it supposed to fell similar? Mine just kinda hurts.

Here’s a description-

Insertable size- 5.5 inch

It’s like a semi hard penis, you can bend it but it’s hard enough(kinda floppy)

It has some veins on it as well