‘Hide’ is a two-fold metaphor. On one hand being thankful for other people having experienced a similar emotion and you thus being able to relate to them. This could be through poetry, a song, movie, etc. The other angle is being passive and agreeing to follow the other person despite what you feel like.
‘Wall’ is about being in a self-destructive mood where everything feels pointless. You know nothing good can come out of punching a wall, but at the same time you’re so down that you don’t see what bad it could cause to get your emotions out.