I think maybe it's to do with one of those fun, heady relationships. You fall quickly and it ends quickly. And all too suddenly she realises that truth.
But it's not just that, because the whole growing pains chorus seems like a completely different thing to me. She's trying to voice her feelings, crying out for help and understanding, but the other person won't take her seriously - it's like trying to say you feel lost, upset or depressed and the other person tells you 'oh, it's just your age' or 'it's because you're a teenager, it's a hard time' etc.
I think maybe it's to do with one of those fun, heady relationships. You fall quickly and it ends quickly. And all too suddenly she realises that truth.
But it's not just that, because the whole growing pains chorus seems like a completely different thing to me. She's trying to voice her feelings, crying out for help and understanding, but the other person won't take her seriously - it's like trying to say you feel lost, upset or depressed and the other person tells you 'oh, it's just your age' or 'it's because you're a teenager, it's a hard time' etc.