telling you what to and not to do

i hate it...really...my dad is telling me who to not be friends with...we've been friends for 10 years....how do you push someone who has been in your life for so long away like that? instantly....this has been on my mind...like the whole weekend...and still...lately ive been getting so emotional so it gets harder...right now im distracting myself; when i cant seem to handle stuff...when i feel like giving up and it all seems like way too much :(...arghhhh.....i really wish i didnt feel this way...