Tw self harm

So the other day I self harmed, not bad but I hadn’t done it in a really long time. Usually I only did it when I was having a panic attack or just extremely sad. But this time was different, I didn’t feel anything at all. I wasn’t sad or panicked and I didn’t regret it or feel sad about it after. Which kinda surprised me. The end of last year and the beginning of this year were extremely awful and I managed to to hurt myself at all so I’m confused as to why I did it now.

Has this happened to anyone else?