I can't take a picture because my phone is screwed up but my natural nails are breaking.

I do not get my nails done, I don't wear fake nails and the last time I did was over 4 years ago, maybe 5 so it's not that.

By breaking, I mean splitting in half. My natural nails are so damn thin that they are splitting in half. It's still connected but washing my hair hurts because the soap gets under the nails.

I don't know what I could do about this, other than take vitamins a guess? Is this a sign of malnutrition?

My toenails are fine though.