It's because you're trying too hard. You think about others' needs so much that you ignore what you want to do. It's admirable that you want to try your best, but you shouldn't force yourself to do things you'll come to regret.
[Pause]
I love you. And I want you. But that doesn't mean I'll demand anything from you.
[Action]
[Pause]
I love you. And I want you. But that doesn't mean I'll demand anything from you.