O' Brother, Where Art Thou?

Brother. Twin. Bestfriend. Worst enemy.
How all these things can relate to this same person baffles me. I spend all day dealing with this one being who's been in my life since conception.  My friend for the longest time, the cause of the majority of my grief, the person who knows me the best, who makes me the angriest, who says the most hurtful things, who cracks the most hilarious jokes, who makes the most insulting comments, this same person who both hurts my feelings constantly and yet constantly reassures me when I'm being doubtful.  He constantly insinuates hurtful things about my sexuality, imposes what he deems to be okay upon me, I'm the target of his incessant anger, I reassure him constantly, am his constant aide when he has problems, the person he tells the best jokes to, the person who constantly has my back.  He is frustrating and infuriating and annoying and I love him even tho I rarely muster the courage or willingness to admit so.  I don't know how life would've turned out for me if it wasn't for him and while I constantly complain almost everything he does, he really has affected my life in everyway possible.  He's been in my school classes ever since we were old enough to be in class, I've never been seperated from him for more than a few days, and I have no clue what I'm going to do when we both head off to college.  We grew up together, we go to school together, we even work together, no matter what we've always been together, and it's weird imagining the fact that we'll actually be seperated for a good long while.  I'm excited to see how life changes how we interact as we both grow older and the amount of interaction we get changes.  They say that siblings often get along better when they don't deal with each other all day, everyday, and I cannot wait to see if it's true.  While I miss having a best friend, I'd prefer to have a brother, so hopefully life turns out well.