Life is so depressing ..hElp me pls...i need urgent advise..?

I dont know whats up with me, i have a realy hard time getting along with people..and the only person in my life thas really close to me right now is my dear bF, who is my best friend..and of course theres my family but other than that i have like no freinds and i dont knw why i just have pushed everyone away by finding some faults in them and getting angry at them and..well i feel they should treat me beter but i guess i handled it wrong and was mean to them..now im left with nothing and i feel so sad..i dont go nehwere..i have few friends i could go out with but just no mood..and to make it worse..this guy that i kind of started to like..he is moving to another state..which is really puting the whipped cream on my depression rite now...all i do is sit at home n feel so sad n cry....what do i do..and why am i like this...how do i turn myself around...