Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
If you're trying to be graceful and polite you have to cut certain words out of your vocabulary. The number one being sh*t (しと). You can't say you need to "go take a sh*t" during an international conference or a fancy dinner! You need to be modest and not use that word, geez.
Even now there are many men who like modest women.