Is it my constitutional right to marry my mailbox?

We love each other, so what does it matter shes a mailbox. True love is true love, and it's my right to marry whomever I see fit. And also, why can I only be married to one thing? Theres this y American Sycamore in my backyard thats smokin' hot, I want to marry her too. Why not? If dudes can marry dudes, why can't I marry mailboxes?