Just One Time.. Okay?

My name is Zy. I'm not going into last names, because mine has no actual context. I'm 16 years old... Well, I still feel sixteen. I technically turned seventeen two weeks ago.
I have few friends, but there is this one guy. His name is Mark. We've been close friends for.. As long as my brain can physically remember. He left one day, it's been maybe twelve years and we haven't seen each other, I feel like I've forgotten his face. I'm not sure what to do about it, until I get a chirpy doorbell ring in the middle of day, throwing the rest of my life off course.. As if it wasn't messed up already.