Err...you really are quite pessimistic. No good ah....library
has some self-help books which may be useful. Sometimes in life, it
does not matter what others think of u lor. These people come and
go. They dun matter in your life. What matters is that you know
what you did was the best and most appropriate in that
situation.
Maybe one way is to smile to them, say good morning. 
Look bright and sunny. Or try talking to them on common
topics...(ya...is very hard I know). Or just smile lah. Sometime
people dun want to interact with u coz you are temp. Last time I
temp job, the superior dun bully me already happy, they dun eat
with me happier. But when perm job, usually colleagues' attitude
change one lor.
For the rest , thanks for all the other replies. I feel better
already knowing its not ONLY my problem. 
