maybe take up a new hobby (this isnt a get away from ffxi post) i mean actually try something else (you can keep playing ffxi just saying try something on top of that).
this will let you broaden your friendships, and find new friends. it sounds like you dont have a lot of friends that you really LOVE hanging out with.
take up a sport, start going to the gym, play guitar, do something different that will allow you to meet new friends that will possibly replace your old not so good friends.
not sure how old you are, but when I was in highschool i had good friends, but they werent great. my girlfriend was great, so I spent most of my time with her, but when I left highschool and ended it with my girlfriend, I came to university with a whole new look on things. found some new friends, joined a fraternity, and im having a great time. I live with 3 of my best friends, and I dont know what id do without them.
if you are still in high school, then look forward to only the best of changes in your future!
life always moves on man, and tomorrow will always differ from today in some small seemingly insignificant way. the changes only seem major when you look back on them.
good luck, and try not to beat yourself up over your parents' divorce, lots of my friends have been through it (i luckily havent) and nothing good can come from letting it ruin your mood.