Questioning Love...

What is love? Why do we try so hard to get it and then reject it when we have it? Is that something only I do? Are there other people out there that do this? How much love to you give without receiving before you stop giving? Didn't God say to always give love because He is love? How do you know you've found the one? What if you think they're the one but they don't think they are? Does doubting your love for someone mean something? Why do I stay awake thinking silly thoughts like this when I should be sleeping?