This one is easy, if you think about the lyrics in sections, not as a whole (bad pun, I know). The song is about how the singer keeps all his pain and anguish inside himself, to more or less kill his emotions ("Is this helping, I'm growing weaker each day"). By doing so, he's slowly building himself to be stronger by accepting and dealing with the emotions. Also, he doesn't want anyone to try to take his pain from him, hence why "It's mine, it's pure and as decent as I could make myself." He wants his suffering for himself so he can be strong.
This one is easy, if you think about the lyrics in sections, not as a whole (bad pun, I know). The song is about how the singer keeps all his pain and anguish inside himself, to more or less kill his emotions ("Is this helping, I'm growing weaker each day"). By doing so, he's slowly building himself to be stronger by accepting and dealing with the emotions. Also, he doesn't want anyone to try to take his pain from him, hence why "It's mine, it's pure and as decent as I could make myself." He wants his suffering for himself so he can be strong.