I was thinking the same though. It doesn't interact often, but if it randomly does annihilate with another particle in your body, at such a small scale (subatomic) that force/pressure just destroys anything in its path no? Like a paint flake hitting a space ship. Or is it more like "light" (since they're iirc their own antiparticle), which is then absorbed by surrounding matter and turns into heat?

In the wrong spot, this sounds to me like it kills you?

Nothing to be afraid of, of course, for the reason you mentioned. Just wondering, xkcd "what if" style