"
them.
I walk with my head down,
Trying to block you out, cause I'll never impress you.
I just want to feel okay
Taylor is explaining that a bully will make you, well feel unlike yourself. She's saying you'll probably be embarrassed, and people will laugh at you. You don't want a bully to push you around, so you try to ignore them, but you never feel like standing up to yourself to make the bully back away. She wants to feel normal again, basically.