At this age, everything is changing. Day by day we don't notice, but just look back over the past year and you will realize everything has. People you thought were going to be there forever aren't, and people you never imagined you'd be speaking to are now some of your closest friends.
Life makes little sense, and the more we grow the less sense it will make. So make the most of it now, before it all changes once again, because in the near future, all of this is only going to be memories.