Almost the whole poem is a string of questions, and that is the point. The speaker asks how to hide from watching eyes, why people are cruel, how to describe the darkest feelings, how to hold yourself together when you feel broken, and how to keep hope. There are no answers, only more questions piling up, which makes the poem feel like a mind that can't switch off.
The speaker feels lonely, overwhelmed, and tired of holding things in. The line about noise getting louder when you want it to end suggests anxiety or distress that grows the harder you fight it. The ending is the most striking part. These questions "are never heard" because they are never asked, and the speaker explains that no one asks because no one knows how to answer. The mood is quiet and heavy, but it is also honest. By saying the answers "aren't that simple," the speaker admits how big these feelings are, while the poem itself becomes a way of finally speaking them aloud.