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Sep 13th 2018!⃝I think the interpretations listed before me miss something very important, the only line that actually puts some perspective to what is actually going on with the singer's life, why he saught out these people:
"I'll say hi, but not reply to the letters that you write because i've found some piece of mind."
The singer is recovering from some bad relationship (a deep relationship, but not necessarily romantic. Could be anything), one that left his life and sense of self in shambles. He feels like he is small, and as if he's all alone in this great big world.
He meets these fellows who represent different perspectives, one is a lot worse of from him and a lot better off by apperances (this could pertain to anything, looks, financial status, life), but he soon discovers by their words that these apperances mean nothing.
"You're only as tall as your heart will let you be." You are only as good, as whole, as happy, as confident, as you let yourself be. Nothing else has the final say in this but you. That person from his past relationship may have made him feel small, but that's because he let them. He doesn't have to give them control over his own feelings, he can control them.
"You're only as small as the world will make you seem." There are so many people out there, billions. You aren't alone, and that past relationship isn't the only person in the world. The world is huge and it can make you seem small in a good, self concious way. It lets you know there's a lot out there left for you to discover, many people you have yet to meet.
"And when the going gets tough, and you feel like you may fall, just look on the bright side, you're roughly six feet tall." Things will happen, relationships just like this past one may be enevitable. But no matter what, you are you. You're just another human. And that is such a good thing, because you being an average human doesn't define you, you define you. You define yourself by your own heart and the people and things you seek out in the world.
The singer was in a bad place, he experienced a devistating relationship and atill longed for that person that hurt him, that mad him feel awful. But after his soul searching, he has discovered that it wasn't them who wrecked him but himself. And he doesn't need that person to feel good again, to build himself back up. He doesn't need them anymore, because he has taken charge of his own life. And something like this may happen again, and he may feel this way yet again, but even if he does, he can now see the brightside, he's just another human in a great big world.