Wow, am I relly in this state of mind?

I think I hate it here.  I have no friends here.  Feel like an outsider.  I think I creeped a girl out today.  Is it possible I have wasted this much money, and am now stuck here for 5 weeks?  I'd rather be at work.  They like me there.  How do I tell people when I get back?  They ask "How was London?".  I say "It sucked."  Awkward pause ensues.  It must be my fault.  My pessimism, bad attitude, not trying, etc.  I don't know how to change it.  I should never have come.